51572666 has 4 divisors (see below), whose sum is σ = 77359002. Its totient is φ = 25786332.

The previous prime is 51572659. The next prime is 51572671. The reversal of 51572666 is 66627515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 26822041 + 24750625 = 5179^2 + 4975^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12893165 + ... + 12893168.

Almost surely, 2^51572666 is an apocalyptic number.

51572666 is a deficient number, since it is larger than the sum of its proper divisors (25786336).

51572666 is a wasteful number, since it uses less digits than its factorization.

51572666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25786335.

The product of its digits is 75600, while the sum is 38.

The square root of 51572666 is about 7181.4111426655. The cubic root of 51572666 is about 372.2258475559.

The spelling of 51572666 in words is "fifty-one million, five hundred seventy-two thousand, six hundred sixty-six".