2640202551 has 48 divisors (see below), whose sum is σ = 4635321600. Its totient is φ = 1414485504.

The previous prime is 2640202547. The next prime is 2640202571. The reversal of 2640202551 is 1552020462.

2640202551 is a `hidden beast` number, since 2 + 6 + 402 + 0 + 255 + 1 = 666.

It is not a de Polignac number, because 2640202551 - 2² = 2640202547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640202501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 104740 + ... + 127478.

It is an arithmetic number, because the mean of its divisors is an integer number (96569200).

Almost surely, 2^2640202551 is an apocalyptic number.

2640202551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2640202551 is a deficient number, since it is larger than the sum of its proper divisors (1995119049).

2640202551 is a wasteful number, since it uses less digits than its factorization.

2640202551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22868 (or 22865 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 2640202551 is about 51382.9013486004. The cubic root of 2640202551 is about 1382.1199913896.

The spelling of 2640202551 in words is "two billion, six hundred forty million, two hundred two thousand, five hundred fifty-one".