2665513608381 has 48 divisors (see below), whose sum is σ = 4243358094976. Its totient is φ = 1601951395968.

The previous prime is 2665513608377. The next prime is 2665513608409. The reversal of 2665513608381 is 1838063155662.

It is a happy number.

2665513608381 is a `hidden beast` number, since 2 + 6 + 6 + 551 + 3 + 6 + 0 + 8 + 3 + 81 = 666.

It is not a de Polignac number, because 2665513608381 - 2² = 2665513608377 is a prime.

It is a super-2 number, since 2×2665513608381² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665513608581) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41810976 + ... + 41874678.

Almost surely, 2^{2665513608381} is an apocalyptic number.

It is an amenable number.

2665513608381 is a deficient number, since it is larger than the sum of its proper divisors (1577844486595).

2665513608381 is a wasteful number, since it uses less digits than its factorization.

2665513608381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72082 (or 72079 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 54.

The spelling of 2665513608381 in words is "two trillion, six hundred sixty-five billion, five hundred thirteen million, six hundred eight thousand, three hundred eighty-one".