2531099664 has 70 divisors (see below), whose sum is σ = 7352678766. Its totient is φ = 843696000.

The previous prime is 2531099609. The next prime is 2531099677. The reversal of 2531099664 is 4669901352.

It can be written as a sum of positive squares in only one way, i.e., 1649009664 + 882090000 = 40608^2 + 29700^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 96837 + ... + 120164.

Almost surely, 2^2531099664 is an apocalyptic number.

2531099664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2531099664 is an abundant number, since it is smaller than the sum of its proper divisors (4821579102).

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

2531099664 is an equidigital number, since it uses as much as digits as its factorization.

2531099664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217027 (or 217006 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 2531099664 is about 50310.0354203811. The cubic root of 2531099664 is about 1362.8134634834.

The spelling of 2531099664 in words is "two billion, five hundred thirty-one million, ninety-nine thousand, six hundred sixty-four".