2640787149961 has 8 divisors (see below), whose sum is σ = 2756245371264. Its totient is φ = 2525382377760.

The previous prime is 2640787149947. The next prime is 2640787149977. The reversal of 2640787149961 is 1699417870462.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2640787149961 - 2⁹ = 2640787149449 is a prime.

It is a super-2 number, since 2×2640787149961² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2640787149893 and 2640787149902.

It is not an unprimeable number, because it can be changed into a prime (2640787149361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13261285 + ... + 13458946.

It is an arithmetic number, because the mean of its divisors is an integer number (344530671408).

Almost surely, 2^{2640787149961} is an apocalyptic number.

It is an amenable number.

2640787149961 is a deficient number, since it is larger than the sum of its proper divisors (115458221303).

2640787149961 is a wasteful number, since it uses less digits than its factorization.

2640787149961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26724551.

The product of its (nonzero) digits is 36578304, while the sum is 64.

The spelling of 2640787149961 in words is "two trillion, six hundred forty billion, seven hundred eighty-seven million, one hundred forty-nine thousand, nine hundred sixty-one".