61507100616551 has 32 divisors (see below), whose sum is σ = 69090031296000. Its totient is φ = 54542738371968.

The previous prime is 61507100616419. The next prime is 61507100616557. The reversal of 61507100616551 is 15561600170516.

It is a happy number.

It is not a de Polignac number, because 61507100616551 - 2²⁶ = 61507033507687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61507100616557) 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, 16481756 + ... + 19866113.

It is an arithmetic number, because the mean of its divisors is an integer number (2159063478000).

Almost surely, 2^{61507100616551} is an apocalyptic number.

61507100616551 is a deficient number, since it is larger than the sum of its proper divisors (7582930679449).

61507100616551 is a wasteful number, since it uses less digits than its factorization.

61507100616551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36348023.

The product of its (nonzero) digits is 189000, while the sum is 44.

The spelling of 61507100616551 in words is "sixty-one trillion, five hundred seven billion, one hundred million, six hundred sixteen thousand, five hundred fifty-one".