2601605630691 has 24 divisors (see below), whose sum is σ = 3796932758736. Its totient is φ = 1716393758400.

The previous prime is 2601605630683. The next prime is 2601605630713. The reversal of 2601605630691 is 1960365061062.

2601605630691 is a `hidden beast` number, since 2 + 6 + 0 + 1 + 6 + 0 + 5 + 630 + 6 + 9 + 1 = 666.

It is not a de Polignac number, because 2601605630691 - 2³ = 2601605630683 is a prime.

It is a super-2 number, since 2×2601605630691² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2601605630621) 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, 1169136 + ... + 2563218.

It is an arithmetic number, because the mean of its divisors is an integer number (158205531614).

Almost surely, 2^{2601605630691} is an apocalyptic number.

2601605630691 is a deficient number, since it is larger than the sum of its proper divisors (1195327128045).

2601605630691 is a wasteful number, since it uses less digits than its factorization.

2601605630691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396243 (or 1396240 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The spelling of 2601605630691 in words is "two trillion, six hundred one billion, six hundred five million, six hundred thirty thousand, six hundred ninety-one".