66351857 has 16 divisors (see below), whose sum is σ = 82057920. Its totient is φ = 52747200.

The previous prime is 66351853. The next prime is 66351869. The reversal of 66351857 is 75815366.

It is not a de Polignac number, because 66351857 - 2² = 66351853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66351853) 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, 9494 + ... + 14927.

It is an arithmetic number, because the mean of its divisors is an integer number (5128620).

Almost surely, 2^66351857 is an apocalyptic number.

It is an amenable number.

66351857 is a deficient number, since it is larger than the sum of its proper divisors (15706063).

66351857 is a wasteful number, since it uses less digits than its factorization.

66351857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24464.

The product of its digits is 151200, while the sum is 41.

The square root of 66351857 is about 8145.6649206802. The cubic root of 66351857 is about 404.8408804377.

The spelling of 66351857 in words is "sixty-six million, three hundred fifty-one thousand, eight hundred fifty-seven".