66854818944 has 96 divisors (see below), whose sum is σ = 194180023440. Its totient is φ = 22076628480.

The previous prime is 66854818931. The next prime is 66854818969. The reversal of 66854818944 is 44981845866.

66854818944 is a `hidden beast` number, since 6 + 6 + 8 + 548 + 1 + 89 + 4 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147922 + ... + 394449.

Almost surely, 2^66854818944 is an apocalyptic number.

66854818944 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66854818944 is an abundant number, since it is smaller than the sum of its proper divisors (127325204496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66854818944 is a wasteful number, since it uses less digits than its factorization.

66854818944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542498 (or 542483 counting only the distinct ones).

The product of its digits is 53084160, while the sum is 63.

The spelling of 66854818944 in words is "sixty-six billion, eight hundred fifty-four million, eight hundred eighteen thousand, nine hundred forty-four".