2491951680 has 84 divisors (see below), whose sum is σ = 8571285372. Its totient is φ = 664519680.

The previous prime is 2491951663. The next prime is 2491951727. The reversal of 2491951680 is 861591942.

2491951680 is a `hidden beast` number, since 2 + 49 + 19 + 516 + 80 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1952225856 + 539725824 = 44184^2 + 23232^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 429751 + ... + 435510.

Almost surely, 2^2491951680 is an apocalyptic number.

2491951680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2491951680 is an abundant number, since it is smaller than the sum of its proper divisors (6079333692).

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

2491951680 is a wasteful number, since it uses less digits than its factorization.

2491951680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865284 (or 865271 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 2491951680 is about 49919.4519200682. The cubic root of 2491951680 is about 1355.7508091444.

The spelling of 2491951680 in words is "two billion, four hundred ninety-one million, nine hundred fifty-one thousand, six hundred eighty".