66579901953644 has 24 divisors (see below), whose sum is σ = 117833468341680. Its totient is φ = 32913256932864.

The previous prime is 66579901953629. The next prime is 66579901953661. The reversal of 66579901953644 is 44635910997566.

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, 3095054 + ... + 11947349.

It is an arithmetic number, because the mean of its divisors is an integer number (4909727847570).

Almost surely, 2^{66579901953644} is an apocalyptic number.

It is an amenable number.

66579901953644 is a deficient number, since it is larger than the sum of its proper divisors (51253566388036).

66579901953644 is a wasteful number, since it uses less digits than its factorization.

66579901953644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15054929 (or 15054927 counting only the distinct ones).

The product of its (nonzero) digits is 1322697600, while the sum is 74.

The spelling of 66579901953644 in words is "sixty-six trillion, five hundred seventy-nine billion, nine hundred one million, nine hundred fifty-three thousand, six hundred forty-four".