669251079 has 160 divisors (see below), whose sum is σ = 1306567680. Its totient is φ = 332563968.

The previous prime is 669251059. The next prime is 669251111. The reversal of 669251079 is 970152966.

It is a happy number.

669251079 is a `hidden beast` number, since 6 + 69 + 2 + 510 + 79 = 666.

It is not a de Polignac number, because 669251079 - 2²⁰ = 668202503 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669251059) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 9167787 + ... + 9167859.

It is an arithmetic number, because the mean of its divisors is an integer number (8166048).

Almost surely, 2^669251079 is an apocalyptic number.

669251079 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

669251079 is a deficient number, since it is larger than the sum of its proper divisors (637316601).

669251079 is a wasteful number, since it uses less digits than its factorization.

669251079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 669251079 is about 25869.8874949235. The cubic root of 669251079 is about 874.7078552315.

The spelling of 669251079 in words is "six hundred sixty-nine million, two hundred fifty-one thousand, seventy-nine".