64157666 has 8 divisors (see below), whose sum is σ = 98052444. Its totient is φ = 31473520.

The previous prime is 64157651. The next prime is 64157701. The reversal of 64157666 is 66675146.

It can be written as a sum of positive squares in 2 ways, for example, as 62647225 + 1510441 = 7915^2 + 1229^2 .

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

It is a super-2 number, since 2×64157666² = 8232412213135112, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302525 + ... + 302736.

Almost surely, 2^64157666 is an apocalyptic number.

64157666 is a deficient number, since it is larger than the sum of its proper divisors (33894778).

64157666 is a wasteful number, since it uses less digits than its factorization.

64157666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605316.

The product of its digits is 181440, while the sum is 41.

The square root of 64157666 is about 8009.8480634779. The cubic root of 64157666 is about 400.3282014692.

The spelling of 64157666 in words is "sixty-four million, one hundred fifty-seven thousand, six hundred sixty-six".