66625649279 has 8 divisors (see below), whose sum is σ = 76324466208. Its totient is φ = 56972049120.

The previous prime is 66625649267. The next prime is 66625649323. The reversal of 66625649279 is 97294652666.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66625649279 - 2⁸ = 66625649023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66625649239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11301032 + ... + 11306925.

It is an arithmetic number, because the mean of its divisors is an integer number (9540558276).

Almost surely, 2^66625649279 is an apocalyptic number.

66625649279 is a deficient number, since it is larger than the sum of its proper divisors (9698816929).

66625649279 is a wasteful number, since it uses less digits than its factorization.

66625649279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22608385.

The product of its digits is 58786560, while the sum is 62.

The spelling of 66625649279 in words is "sixty-six billion, six hundred twenty-five million, six hundred forty-nine thousand, two hundred seventy-nine".