255706237557 has 16 divisors (see below), whose sum is σ = 379797912000. Its totient is φ = 170032589712.

The previous prime is 255706237499. The next prime is 255706237561. The reversal of 255706237557 is 755732607552.

255706237557 is a `hidden beast` number, since 2 + 5 + 5 + 7 + 0 + 623 + 7 + 5 + 5 + 7 = 666.

It is not a de Polignac number, because 255706237557 - 2²² = 255702043253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255706239557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12162507 + ... + 12183512.

It is an arithmetic number, because the mean of its divisors is an integer number (23737369500).

Almost surely, 2^255706237557 is an apocalyptic number.

255706237557 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

255706237557 is a deficient number, since it is larger than the sum of its proper divisors (124091674443).

255706237557 is a wasteful number, since it uses less digits than its factorization.

255706237557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24346417 (or 24346411 counting only the distinct ones).

The product of its (nonzero) digits is 15435000, while the sum is 54.

The spelling of 255706237557 in words is "two hundred fifty-five billion, seven hundred six million, two hundred thirty-seven thousand, five hundred fifty-seven".