66362520857 has 4 divisors (see below), whose sum is σ = 67006817280. Its totient is φ = 65718224436.

The previous prime is 66362520853. The next prime is 66362520869. The reversal of 66362520857 is 75802526366.

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 66362520857 - 2² = 66362520853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66362520853) 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, 322148057 + ... + 322148262.

It is an arithmetic number, because the mean of its divisors is an integer number (16751704320).

Almost surely, 2^66362520857 is an apocalyptic number.

It is an amenable number.

66362520857 is a deficient number, since it is larger than the sum of its proper divisors (644296423).

66362520857 is a wasteful number, since it uses less digits than its factorization.

66362520857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644296422.

The product of its (nonzero) digits is 3628800, while the sum is 50.

The spelling of 66362520857 in words is "sixty-six billion, three hundred sixty-two million, five hundred twenty thousand, eight hundred fifty-seven".