61552739507520 has 224 divisors, whose sum is σ = 202538557584000. Its totient is φ = 15819085062144.

The previous prime is 61552739507507. The next prime is 61552739507527. The reversal of 61552739507520 is 2570593725516.

It is a super-2 number, since 2×61552739507520² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61552739507527) 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, 13207506 + ... + 17249454.

Almost surely, 2^{61552739507520} is an apocalyptic number.

61552739507520 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 61552739507520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101269278792000).

61552739507520 is an abundant number, since it is smaller than the sum of its proper divisors (140985818076480).

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

61552739507520 is a wasteful number, since it uses less digits than its factorization.

61552739507520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042545 (or 4042535 counting only the distinct ones).

The product of its (nonzero) digits is 19845000, while the sum is 57.

The spelling of 61552739507520 in words is "sixty-one trillion, five hundred fifty-two billion, seven hundred thirty-nine million, five hundred seven thousand, five hundred twenty".