669251957 has 16 divisors (see below), whose sum is σ = 754522560. Its totient is φ = 588336000.

The previous prime is 669251951. The next prime is 669251969. The reversal of 669251957 is 759152966.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 669251957 - 2¹⁸ = 668989813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669251951) 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, 40769 + ... + 54777.

It is an arithmetic number, because the mean of its divisors is an integer number (47157660).

Almost surely, 2^669251957 is an apocalyptic number.

It is an amenable number.

669251957 is a deficient number, since it is larger than the sum of its proper divisors (85270603).

669251957 is a wasteful number, since it uses less digits than its factorization.

669251957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14164.

The product of its digits is 1020600, while the sum is 50.

The square root of 669251957 is about 25869.9044644544. The cubic root of 669251957 is about 874.7082377453.

The spelling of 669251957 in words is "six hundred sixty-nine million, two hundred fifty-one thousand, nine hundred fifty-seven".