66572139 has 16 divisors (see below), whose sum is σ = 94309920. Its totient is φ = 41690880.

The previous prime is 66572137. The next prime is 66572141. The reversal of 66572139 is 93127566.

It is an interprime number because it is at equal distance from previous prime (66572137) and next prime (66572141).

It is not a de Polignac number, because 66572139 - 2¹ = 66572137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66572097 and 66572106.

It is not an unprimeable number, because it can be changed into a prime (66572137) 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, 7122 + ... + 13559.

It is an arithmetic number, because the mean of its divisors is an integer number (5894370).

Almost surely, 2^66572139 is an apocalyptic number.

66572139 is a deficient number, since it is larger than the sum of its proper divisors (27737781).

66572139 is a wasteful number, since it uses less digits than its factorization.

66572139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20750.

The product of its digits is 68040, while the sum is 39.

The square root of 66572139 is about 8159.1751421329. The cubic root of 66572139 is about 405.2883969335.

The spelling of 66572139 in words is "sixty-six million, five hundred seventy-two thousand, one hundred thirty-nine".