66968279 has 16 divisors (see below), whose sum is σ = 80870400. Its totient is φ = 54235104.

The previous prime is 66968269. The next prime is 66968299. The reversal of 66968279 is 97286966.

It is not a de Polignac number, because 66968279 - 2⁸ = 66968023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66968279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66968269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6032 + ... + 13050.

It is an arithmetic number, because the mean of its divisors is an integer number (5054400).

Almost surely, 2^66968279 is an apocalyptic number.

66968279 is a deficient number, since it is larger than the sum of its proper divisors (13902121).

66968279 is a wasteful number, since it uses less digits than its factorization.

66968279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7102.

The product of its digits is 1959552, while the sum is 53.

The square root of 66968279 is about 8183.4148739997. The cubic root of 66968279 is about 406.0907022311.

The spelling of 66968279 in words is "sixty-six million, nine hundred sixty-eight thousand, two hundred seventy-nine".