61564505007 has 32 divisors (see below), whose sum is σ = 90718548480. Its totient is φ = 36938992640.

The previous prime is 61564504999. The next prime is 61564505027. The reversal of 61564505007 is 70050546516.

It is not a de Polignac number, because 61564505007 - 2³ = 61564504999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61564505027) 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, 8173219 + ... + 8180747.

It is an arithmetic number, because the mean of its divisors is an integer number (2834954640).

Almost surely, 2^61564505007 is an apocalyptic number.

61564505007 is a deficient number, since it is larger than the sum of its proper divisors (29154043473).

61564505007 is a wasteful number, since it uses less digits than its factorization.

61564505007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14543.

The product of its (nonzero) digits is 126000, while the sum is 39.

The spelling of 61564505007 in words is "sixty-one billion, five hundred sixty-four million, five hundred five thousand, seven".