255645287391 has 12 divisors (see below), whose sum is σ = 367084946648. Its totient is φ = 157318233744.

The previous prime is 255645287383. The next prime is 255645287399. The reversal of 255645287391 is 193782546552.

It is an interprime number because it is at equal distance from previous prime (255645287383) and next prime (255645287399).

It is not a de Polignac number, because 255645287391 - 2³ = 255645287383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255645287399) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3117076 + ... + 3198038.

Almost surely, 2^255645287391 is an apocalyptic number.

255645287391 is a deficient number, since it is larger than the sum of its proper divisors (111439659257).

255645287391 is an frugal number, since it uses more digits than its factorization.

255645287391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161942 (or 80979 counting only the distinct ones).

The product of its digits is 18144000, while the sum is 57.

The spelling of 255645287391 in words is "two hundred fifty-five billion, six hundred forty-five million, two hundred eighty-seven thousand, three hundred ninety-one".