66370857 has 32 divisors (see below), whose sum is σ = 106982400. Its totient is φ = 35754048.

The previous prime is 66370807. The next prime is 66370877. The reversal of 66370857 is 75807366.

It is not a de Polignac number, because 66370857 - 2¹⁴ = 66354473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66370807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158194 + ... + 158612.

It is an arithmetic number, because the mean of its divisors is an integer number (3343200).

Almost surely, 2^66370857 is an apocalyptic number.

It is an amenable number.

66370857 is a deficient number, since it is larger than the sum of its proper divisors (40611543).

66370857 is a wasteful number, since it uses less digits than its factorization.

66370857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845.

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 66370857 is about 8146.8311017229. The cubic root of 66370857 is about 404.8795191083.

The spelling of 66370857 in words is "sixty-six million, three hundred seventy thousand, eight hundred fifty-seven".