66621412955912 has 32 divisors (see below), whose sum is σ = 129802041734400. Its totient is φ = 32017836911424.

The previous prime is 66621412955893. The next prime is 66621412956011. The reversal of 66621412955912 is 21955921412666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 643807598 + ... + 643911069.

It is an arithmetic number, because the mean of its divisors is an integer number (4056313804200).

Almost surely, 2^{66621412955912} is an apocalyptic number.

It is an amenable number.

66621412955912 is a deficient number, since it is larger than the sum of its proper divisors (63180628778488).

66621412955912 is a wasteful number, since it uses less digits than its factorization.

66621412955912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287718925 (or 1287718921 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 59.

The spelling of 66621412955912 in words is "sixty-six trillion, six hundred twenty-one billion, four hundred twelve million, nine hundred fifty-five thousand, nine hundred twelve".