2660400064400 has 60 divisors (see below), whose sum is σ = 6883273564692. Its totient is φ = 982301560320.

The previous prime is 2660400064379. The next prime is 2660400064481. The reversal of 2660400064400 is 44600040662.

2660400064400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 8036046736 + 2652364017664 = 89644^2 + 1628608^2 .

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, 255802499 + ... + 255812898.

Almost surely, 2^{2660400064400} is an apocalyptic number.

2660400064400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2660400064400 is an abundant number, since it is smaller than the sum of its proper divisors (4222873500292).

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

2660400064400 is a wasteful number, since it uses less digits than its factorization.

2660400064400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511615428 (or 511615417 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The spelling of 2660400064400 in words is "two trillion, six hundred sixty billion, four hundred million, sixty-four thousand, four hundred".