861564346513 has 16 divisors (see below), whose sum is σ = 959941120320. Its totient is φ = 767779838784.

The previous prime is 861564346501. The next prime is 861564346547. The reversal of 861564346513 is 315643465168.

It is a cyclic number.

It is not a de Polignac number, because 861564346513 - 2³⁷ = 724125393041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861564346583) 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, 3345370 + ... + 3593692.

It is an arithmetic number, because the mean of its divisors is an integer number (59996320020).

Almost surely, 2^861564346513 is an apocalyptic number.

It is an amenable number.

861564346513 is a deficient number, since it is larger than the sum of its proper divisors (98376773807).

861564346513 is a wasteful number, since it uses less digits than its factorization.

861564346513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257568.

The product of its digits is 6220800, while the sum is 52.

The spelling of 861564346513 in words is "eight hundred sixty-one billion, five hundred sixty-four million, three hundred forty-six thousand, five hundred thirteen".