2661256512104 has 64 divisors (see below), whose sum is σ = 5690785636800. Its totient is φ = 1158850796544.

The previous prime is 2661256512073. The next prime is 2661256512127. The reversal of 2661256512104 is 4012156521662.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11864447 + ... + 12086670.

It is an arithmetic number, because the mean of its divisors is an integer number (88918525575).

Almost surely, 2^{2661256512104} is an apocalyptic number.

It is an amenable number.

2661256512104 is an abundant number, since it is smaller than the sum of its proper divisors (3029529124696).

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

2661256512104 is a wasteful number, since it uses less digits than its factorization.

2661256512104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23951202 (or 23951198 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 2661256512104 in words is "two trillion, six hundred sixty-one billion, two hundred fifty-six million, five hundred twelve thousand, one hundred four".