61551516511057 has 8 divisors (see below), whose sum is σ = 61751005348032. Its totient is φ = 61352037764400.

The previous prime is 61551516510937. The next prime is 61551516511087. The reversal of 61551516511057 is 75011561515516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61551516511057 - 2¹⁹ = 61551515986769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61551516511057.

It is not an unprimeable number, because it can be changed into a prime (61551516511087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9794598 + ... + 14799904.

It is an arithmetic number, because the mean of its divisors is an integer number (7718875668504).

Almost surely, 2^{61551516511057} is an apocalyptic number.

It is an amenable number.

61551516511057 is a deficient number, since it is larger than the sum of its proper divisors (199488836975).

61551516511057 is a wasteful number, since it uses less digits than its factorization.

61551516511057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5045159.

The product of its (nonzero) digits is 787500, while the sum is 49.

The spelling of 61551516511057 in words is "sixty-one trillion, five hundred fifty-one billion, five hundred sixteen million, five hundred eleven thousand, fifty-seven".