255191664 has 160 divisors (see below), whose sum is σ = 833835520. Its totient is φ = 65442816.

The previous prime is 255191653. The next prime is 255191687. The reversal of 255191664 is 466191552.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 160827 + ... + 162405.

It is an arithmetic number, because the mean of its divisors is an integer number (5211472).

Almost surely, 2^255191664 is an apocalyptic number.

255191664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255191664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (416917760).

255191664 is an abundant number, since it is smaller than the sum of its proper divisors (578643856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255191664 is a wasteful number, since it uses less digits than its factorization.

255191664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647 (or 1641 counting only the distinct ones).

The product of its digits is 64800, while the sum is 39.

The square root of 255191664 is about 15974.7195280543. The cubic root of 255191664 is about 634.2914070703.

The spelling of 255191664 in words is "two hundred fifty-five million, one hundred ninety-one thousand, six hundred sixty-four".