2651005965840 has 80 divisors (see below), whose sum is σ = 8226797254848. Its totient is φ = 706188364288.

The previous prime is 2651005965823. The next prime is 2651005965847. The reversal of 2651005965840 is 485695001562.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (2651005965847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5604747 + ... + 6059306.

Almost surely, 2^{2651005965840} is an apocalyptic number.

2651005965840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2651005965840 is an abundant number, since it is smaller than the sum of its proper divisors (5575791289008).

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

2651005965840 is a wasteful number, since it uses less digits than its factorization.

2651005965840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11665016 (or 11665010 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 51.

The spelling of 2651005965840 in words is "two trillion, six hundred fifty-one billion, five million, nine hundred sixty-five thousand, eight hundred forty".