640655466154 has 32 divisors (see below), whose sum is σ = 1059647018112. Its totient is φ = 290480344000.

The previous prime is 640655466133. The next prime is 640655466173. The reversal of 640655466154 is 451664556046.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 767379 + ... + 1367545.

It is an arithmetic number, because the mean of its divisors is an integer number (33113969316).

Almost surely, 2^640655466154 is an apocalyptic number.

640655466154 is a deficient number, since it is larger than the sum of its proper divisors (418991551958).

640655466154 is a wasteful number, since it uses less digits than its factorization.

640655466154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600603 (or 600581 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 52.

The spelling of 640655466154 in words is "six hundred forty billion, six hundred fifty-five million, four hundred sixty-six thousand, one hundred fifty-four".