61955955424 has 192 divisors, whose sum is σ = 141969542400. Its totient is φ = 26347417600.

The previous prime is 61955955367. The next prime is 61955955437. The reversal of 61955955424 is 42455955916.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74916099 + ... + 74916925.

It is an arithmetic number, because the mean of its divisors is an integer number (739424700).

Almost surely, 2^61955955424 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 61955955424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70984771200).

61955955424 is an abundant number, since it is smaller than the sum of its proper divisors (80013586976).

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

61955955424 is a wasteful number, since it uses less digits than its factorization.

61955955424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097 (or 1089 counting only the distinct ones).

The product of its digits is 9720000, while the sum is 55.

The spelling of 61955955424 in words is "sixty-one billion, nine hundred fifty-five million, nine hundred fifty-five thousand, four hundred twenty-four".