61583799420 has 600 divisors, whose sum is σ = 230202525168. Its totient is φ = 13780990080.

The previous prime is 61583799413. The next prime is 61583799427. The reversal of 61583799420 is 2499738516.

It is an interprime number because it is at equal distance from previous prime (61583799413) and next prime (61583799427).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 5577 × 2145 × 5148.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61583799427) by changing a digit.

It is a polite number, since it can be written in 199 ways as a sum of consecutive naturals, for example, 4737215334 + ... + 4737215346.

It is a 4-persistent number, because k⋅61583799420 is pandigital for 1 ≤ k ≤ 4, but not for k = 5.

Almost surely, 2^61583799420 is an apocalyptic number.

61583799420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61583799420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115101262584).

61583799420 is an abundant number, since it is smaller than the sum of its proper divisors (168618725748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61583799420 is an equidigital number, since it uses as much as digits as its factorization.

61583799420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 61583799420 in words is "sixty-one billion, five hundred eighty-three million, seven hundred ninety-nine thousand, four hundred twenty".