255402615520 has 144 divisors (see below), whose sum is σ = 653799997872. Its totient is φ = 94240972800.

The previous prime is 255402615497. The next prime is 255402615521. The reversal of 255402615520 is 25516204552.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 255402615520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255402615521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77089384 + ... + 77092696.

It is an arithmetic number, because the mean of its divisors is an integer number (4540277763).

Almost surely, 2^255402615520 is an apocalyptic number.

255402615520 is a gapful number since it is divisible by the number (20) 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 255402615520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326899998936).

255402615520 is an abundant number, since it is smaller than the sum of its proper divisors (398397382352).

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

255402615520 is a wasteful number, since it uses less digits than its factorization.

255402615520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6205 (or 6184 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 255402615520 in words is "two hundred fifty-five billion, four hundred two million, six hundred fifteen thousand, five hundred twenty".