66212737657 has 16 divisors (see below), whose sum is σ = 76593148992. Its totient is φ = 56569553920.

The previous prime is 66212737609. The next prime is 66212737667. The reversal of 66212737657 is 75673721266.

It is not a de Polignac number, because 66212737657 - 2¹¹ = 66212735609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66212737667) 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, 131488 + ... + 386929.

It is an arithmetic number, because the mean of its divisors is an integer number (4787071812).

Almost surely, 2^66212737657 is an apocalyptic number.

It is an amenable number.

66212737657 is a deficient number, since it is larger than the sum of its proper divisors (10380411335).

66212737657 is a wasteful number, since it uses less digits than its factorization.

66212737657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519128.

The product of its digits is 4445280, while the sum is 52.

The spelling of 66212737657 in words is "sixty-six billion, two hundred twelve million, seven hundred thirty-seven thousand, six hundred fifty-seven".