66865496 has 16 divisors (see below), whose sum is σ = 125462400. Its totient is φ = 33408864.

The previous prime is 66865493. The next prime is 66865499. The reversal of 66865496 is 69456866.

It is an interprime number because it is at equal distance from previous prime (66865493) and next prime (66865499).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66865493) 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, 16046 + ... + 19778.

It is an arithmetic number, because the mean of its divisors is an integer number (7841400).

Almost surely, 2^66865496 is an apocalyptic number.

It is an amenable number.

66865496 is a deficient number, since it is larger than the sum of its proper divisors (58596904).

66865496 is a wasteful number, since it uses less digits than its factorization.

66865496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5978 (or 5974 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 50.

The square root of 66865496 is about 8177.1325047354. The cubic root of 66865496 is about 405.8828396764.

The spelling of 66865496 in words is "sixty-six million, eight hundred sixty-five thousand, four hundred ninety-six".