861062566401 has 32 divisors (see below), whose sum is σ = 1356226571520. Its totient is φ = 538723291392.

The previous prime is 861062566381. The next prime is 861062566423. The reversal of 861062566401 is 104665260168.

861062566401 is a `hidden beast` number, since 8 + 6 + 10 + 625 + 6 + 6 + 4 + 0 + 1 = 666.

It is not a de Polignac number, because 861062566401 - 2¹¹ = 861062564353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861062566201) 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, 13047976 + ... + 13113801.

It is an arithmetic number, because the mean of its divisors is an integer number (42382080360).

Almost surely, 2^861062566401 is an apocalyptic number.

It is an amenable number.

861062566401 is a deficient number, since it is larger than the sum of its proper divisors (495164005119).

861062566401 is a wasteful number, since it uses less digits than its factorization.

861062566401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26161862 (or 26161856 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 861062566401 in words is "eight hundred sixty-one billion, sixty-two million, five hundred sixty-six thousand, four hundred one".