2645256132666 has 48 divisors (see below), whose sum is σ = 6838077084480. Its totient is φ = 755787465720.

The previous prime is 2645256132647. The next prime is 2645256132703. The reversal of 2645256132666 is 6662316525462.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 499856790 + ... + 499862081.

It is an arithmetic number, because the mean of its divisors is an integer number (142459939260).

Almost surely, 2^{2645256132666} is an apocalyptic number.

2645256132666 is an abundant number, since it is smaller than the sum of its proper divisors (4192820951814).

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

2645256132666 is a wasteful number, since it uses less digits than its factorization.

2645256132666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999718896 (or 999718883 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 54.

The spelling of 2645256132666 in words is "two trillion, six hundred forty-five billion, two hundred fifty-six million, one hundred thirty-two thousand, six hundred sixty-six".