61557075516 has 48 divisors (see below), whose sum is σ = 143954463744. Its totient is φ = 20473185216.

The previous prime is 61557075499. The next prime is 61557075521.

61557075516 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11605321 + ... + 11610623.

It is an arithmetic number, because the mean of its divisors is an integer number (2999051328).

Almost surely, 2^61557075516 is an apocalyptic number.

It is an amenable number.

61557075516 is an abundant number, since it is smaller than the sum of its proper divisors (82397388228).

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

61557075516 is a wasteful number, since it uses less digits than its factorization.

61557075516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7290 (or 7288 counting only the distinct ones).

The product of its (nonzero) digits is 1102500, while the sum is 48.

The spelling of 61557075516 in words is "sixty-one billion, five hundred fifty-seven million, seventy-five thousand, five hundred sixteen".