2661402638675 has 24 divisors (see below), whose sum is σ = 3635797039632. Its totient is φ = 1916401520000.

The previous prime is 2661402638611. The next prime is 2661402638677. The reversal of 2661402638675 is 5768362041662.

It is not a de Polignac number, because 2661402638675 - 2⁶ = 2661402638611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2661402638675.

It is not an unprimeable number, because it can be changed into a prime (2661402638677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47882264 + ... + 47937813.

It is an arithmetic number, because the mean of its divisors is an integer number (151491543318).

Almost surely, 2^{2661402638675} is an apocalyptic number.

2661402638675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2661402638675 is a deficient number, since it is larger than the sum of its proper divisors (974394400957).

2661402638675 is a wasteful number, since it uses less digits than its factorization.

2661402638675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95820199 (or 95820194 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 56.

The spelling of 2661402638675 in words is "two trillion, six hundred sixty-one billion, four hundred two million, six hundred thirty-eight thousand, six hundred seventy-five".