61722318336 has 320 divisors, whose sum is σ = 203629966848. Its totient is φ = 16209543168.

The previous prime is 61722318331. The next prime is 61722318341. The reversal of 61722318336 is 63381322716.

It is an interprime number because it is at equal distance from previous prime (61722318331) and next prime (61722318341).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61722318331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7855786 + ... + 7863638.

Almost surely, 2^61722318336 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61722318336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101814983424).

61722318336 is an abundant number, since it is smaller than the sum of its proper divisors (141907648512).

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

61722318336 is a wasteful number, since it uses less digits than its factorization.

61722318336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7941 (or 7925 counting only the distinct ones).

The product of its digits is 217728, while the sum is 42.

The spelling of 61722318336 in words is "sixty-one billion, seven hundred twenty-two million, three hundred eighteen thousand, three hundred thirty-six".