2640561864880 has 80 divisors (see below), whose sum is σ = 6260288583744. Its totient is φ = 1035613670400.

The previous prime is 2640561864799. The next prime is 2640561864881. The reversal of 2640561864880 is 884681650462.

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 (2640561864881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 754179 + ... + 2418658.

Almost surely, 2^{2640561864880} is an apocalyptic number.

2640561864880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640561864880 is an abundant number, since it is smaller than the sum of its proper divisors (3619726718864).

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

2640561864880 is a wasteful number, since it uses less digits than its factorization.

2640561864880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3173054 (or 3173048 counting only the distinct ones).

The product of its (nonzero) digits is 17694720, while the sum is 58.

The spelling of 2640561864880 in words is "two trillion, six hundred forty billion, five hundred sixty-one million, eight hundred sixty-four thousand, eight hundred eighty".