66370657 has 4 divisors (see below), whose sum is σ = 66389680. Its totient is φ = 66351636.

The previous prime is 66370649. The next prime is 66370687. The reversal of 66370657 is 75607366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66370657 - 2³ = 66370649 is a prime.

It is a super-2 number, since 2×66370657² = 8810128221223298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66370687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2607 + ... + 11812.

It is an arithmetic number, because the mean of its divisors is an integer number (16597420).

Almost surely, 2^66370657 is an apocalyptic number.

It is an amenable number.

66370657 is a deficient number, since it is larger than the sum of its proper divisors (19023).

66370657 is a wasteful number, since it uses less digits than its factorization.

66370657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19022.

The product of its (nonzero) digits is 158760, while the sum is 40.

The square root of 66370657 is about 8146.8188270024. The cubic root of 66370657 is about 404.8791124239.

The spelling of 66370657 in words is "sixty-six million, three hundred seventy thousand, six hundred fifty-seven".