7857251955 has 48 divisors (see below), whose sum is σ = 15571096320. Its totient is φ = 3590443584.

The previous prime is 7857251951. The next prime is 7857251959. The reversal of 7857251955 is 5591527587.

7857251955 is a `hidden beast` number, since 7 + 8 + 5 + 72 + 519 + 55 = 666.

It is an interprime number because it is at equal distance from previous prime (7857251951) and next prime (7857251959).

It is not a de Polignac number, because 7857251955 - 2² = 7857251951 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7857251951) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1447236 + ... + 1452654.

It is an arithmetic number, because the mean of its divisors is an integer number (324397840).

Almost surely, 2^7857251955 is an apocalyptic number.

7857251955 is a deficient number, since it is larger than the sum of its proper divisors (7713844365).

7857251955 is a wasteful number, since it uses less digits than its factorization.

7857251955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10040 (or 10037 counting only the distinct ones).

The product of its digits is 4410000, while the sum is 54.

The square root of 7857251955 is about 88641.1414355659. The cubic root of 7857251955 is about 1988.0328662584.

The spelling of 7857251955 in words is "seven billion, eight hundred fifty-seven million, two hundred fifty-one thousand, nine hundred fifty-five".