66570639 has 8 divisors (see below), whose sum is σ = 88851072. Its totient is φ = 44335320.

The previous prime is 66570619. The next prime is 66570649. The reversal of 66570639 is 93607566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66570639 - 2⁵ = 66570607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66570639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66570619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7669 + ... + 13854.

It is an arithmetic number, because the mean of its divisors is an integer number (11106384).

Almost surely, 2^66570639 is an apocalyptic number.

66570639 is a deficient number, since it is larger than the sum of its proper divisors (22280433).

66570639 is a wasteful number, since it uses less digits than its factorization.

66570639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22557.

The product of its (nonzero) digits is 204120, while the sum is 42.

The square root of 66570639 is about 8159.0832205585. The cubic root of 66570639 is about 405.2853529316.

The spelling of 66570639 in words is "sixty-six million, five hundred seventy thousand, six hundred thirty-nine".