7513511661 has 36 divisors (see below), whose sum is σ = 11277708000. Its totient is φ = 4820064480.

The previous prime is 7513511659. The next prime is 7513511669. The reversal of 7513511661 is 1661153157.

7513511661 is a `hidden beast` number, since 75 + 13 + 511 + 6 + 61 = 666.

It is not a de Polignac number, because 7513511661 - 2¹ = 7513511659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7513511669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2503840 + ... + 2506838.

Almost surely, 2^7513511661 is an apocalyptic number.

It is an amenable number.

7513511661 is a deficient number, since it is larger than the sum of its proper divisors (3764196339).

7513511661 is a wasteful number, since it uses less digits than its factorization.

7513511661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3394 (or 3362 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 7513511661 is about 86680.5148865649. The cubic root of 7513511661 is about 1958.6085901611.

The spelling of 7513511661 in words is "seven billion, five hundred thirteen million, five hundred eleven thousand, six hundred sixty-one".