61536416512521 has 16 divisors (see below), whose sum is σ = 82252233620480. Its totient is φ = 40922558709120.

The previous prime is 61536416512477. The next prime is 61536416512567. The reversal of 61536416512521 is 12521561463516.

It is not a de Polignac number, because 61536416512521 - 2⁶ = 61536416512457 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61536416513521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12971881 + ... + 17068758.

It is an arithmetic number, because the mean of its divisors is an integer number (5140764601280).

Almost surely, 2^{61536416512521} is an apocalyptic number.

It is an amenable number.

61536416512521 is a deficient number, since it is larger than the sum of its proper divisors (20715817107959).

61536416512521 is a wasteful number, since it uses less digits than its factorization.

61536416512521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30042336.

The product of its digits is 1296000, while the sum is 48.

The spelling of 61536416512521 in words is "sixty-one trillion, five hundred thirty-six billion, four hundred sixteen million, five hundred twelve thousand, five hundred twenty-one".