661682577458 has 64 divisors (see below), whose sum is σ = 1189520640000. Its totient is φ = 270067198464.

The previous prime is 661682577427. The next prime is 661682577497. The reversal of 661682577458 is 854775286166.

It is a super-2 number, since 2×661682577458² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 661682577394 and 661682577403.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9835118 + ... + 9902166.

It is an arithmetic number, because the mean of its divisors is an integer number (18586260000).

Almost surely, 2^661682577458 is an apocalyptic number.

661682577458 is a deficient number, since it is larger than the sum of its proper divisors (527838062542).

661682577458 is a wasteful number, since it uses less digits than its factorization.

661682577458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67419.

The product of its digits is 135475200, while the sum is 65.

The spelling of 661682577458 in words is "six hundred sixty-one billion, six hundred eighty-two million, five hundred seventy-seven thousand, four hundred fifty-eight".