66157207 has 16 divisors (see below), whose sum is σ = 70502400. Its totient is φ = 61981920.

The previous prime is 66157181. The next prime is 66157211. The reversal of 66157207 is 70275166.

It is a cyclic number.

It is not a de Polignac number, because 66157207 - 2⁷ = 66157079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66157237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153282 + ... + 153712.

It is an arithmetic number, because the mean of its divisors is an integer number (4406400).

Almost surely, 2^66157207 is an apocalyptic number.

66157207 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

66157207 is a deficient number, since it is larger than the sum of its proper divisors (4345193).

66157207 is a wasteful number, since it uses less digits than its factorization.

66157207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 66157207 is about 8133.7080719682. The cubic root of 66157207 is about 404.4446118932. Note that the first 3 decimals are identical.

The spelling of 66157207 in words is "sixty-six million, one hundred fifty-seven thousand, two hundred seven".