61899004043520 has 2304 divisors, whose sum is σ = 254168162304000. Its totient is φ = 12781922549760.

The previous prime is 61899004043509. The next prime is 61899004043561. The reversal of 61899004043520 is 2534040099816.

It is a super-3 number, since 3×61899004043520³ (a number of 42 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 56632208094 + ... + 56632209186.

Almost surely, 2^{61899004043520} is an apocalyptic number.

61899004043520 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 61899004043520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127084081152000).

61899004043520 is an abundant number, since it is smaller than the sum of its proper divisors (192269158260480).

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

61899004043520 is a wasteful number, since it uses less digits than its factorization.

61899004043520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261 (or 1233 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 61899004043520 in words is "sixty-one trillion, eight hundred ninety-nine billion, four million, forty-three thousand, five hundred twenty".