66390255 has 12 divisors (see below), whose sum is σ = 115076520. Its totient is φ = 35408112.

The previous prime is 66390239. The next prime is 66390271. The reversal of 66390255 is 55209366.

It is an interprime number because it is at equal distance from previous prime (66390239) and next prime (66390271).

It is not a de Polignac number, because 66390255 - 2⁴ = 66390239 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 737625 + ... + 737714.

It is an arithmetic number, because the mean of its divisors is an integer number (9589710).

Almost surely, 2^66390255 is an apocalyptic number.

66390255 is a deficient number, since it is larger than the sum of its proper divisors (48686265).

66390255 is a wasteful number, since it uses less digits than its factorization.

66390255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475350 (or 1475347 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 66390255 is about 8148.0215389995. The cubic root of 66390255 is about 404.9189595508.

The spelling of 66390255 in words is "sixty-six million, three hundred ninety thousand, two hundred fifty-five".