3872758661 has 12 divisors (see below), whose sum is σ = 4225168548. Its totient is φ = 3546427392.

The previous prime is 3872758621. The next prime is 3872758691. The reversal of 3872758661 is 1668572783.

It can be written as a sum of positive squares in 6 ways, for example, as 1177176100 + 2695582561 = 34310^2 + 51919^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3872758661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3872758621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 170396 + ... + 191781.

It is an arithmetic number, because the mean of its divisors is an integer number (352097379).

Almost surely, 2^3872758661 is an apocalyptic number.

It is an amenable number.

3872758661 is a deficient number, since it is larger than the sum of its proper divisors (352409887).

3872758661 is a wasteful number, since it uses less digits than its factorization.

3872758661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362248 (or 362231 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 53.

The square root of 3872758661 is about 62231.4925178563. The cubic root of 3872758661 is about 1570.3874334251.

The spelling of 3872758661 in words is "three billion, eight hundred seventy-two million, seven hundred fifty-eight thousand, six hundred sixty-one".