66865695 has 32 divisors (see below), whose sum is σ = 115953600. Its totient is φ = 32902272.

The previous prime is 66865681. The next prime is 66865717. The reversal of 66865695 is 59656866.

It is not a de Polignac number, because 66865695 - 2¹⁷ = 66734623 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31941 + ... + 33969.

It is an arithmetic number, because the mean of its divisors is an integer number (3623550).

Almost surely, 2^66865695 is an apocalyptic number.

66865695 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66865695 is a deficient number, since it is larger than the sum of its proper divisors (49087905).

66865695 is a wasteful number, since it uses less digits than its factorization.

66865695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2076 (or 2050 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 51.

The square root of 66865695 is about 8177.1446728060. The cubic root of 66865695 is about 405.8832423285.

The spelling of 66865695 in words is "sixty-six million, eight hundred sixty-five thousand, six hundred ninety-five".