5155115661 has 12 divisors (see below), whose sum is σ = 7703046780. Its totient is φ = 3318235200.

The previous prime is 5155115659. The next prime is 5155115677. The reversal of 5155115661 is 1665115515.

It is a happy number.

5155115661 is a `hidden beast` number, since 51 + 551 + 1 + 56 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1708251561 + 3446864100 = 41331^2 + 58710^2 .

It is not a de Polignac number, because 5155115661 - 2¹ = 5155115659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5155115681) 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, 9875440 + ... + 9875961.

It is an arithmetic number, because the mean of its divisors is an integer number (641920565).

Almost surely, 2^5155115661 is an apocalyptic number.

It is an amenable number.

5155115661 is a deficient number, since it is larger than the sum of its proper divisors (2547931119).

5155115661 is a wasteful number, since it uses less digits than its factorization.

5155115661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19751436 (or 19751433 counting only the distinct ones).

The product of its digits is 22500, while the sum is 36.

The square root of 5155115661 is about 71799.1341243054. The cubic root of 5155115661 is about 1727.4791111396.

The spelling of 5155115661 in words is "five billion, one hundred fifty-five million, one hundred fifteen thousand, six hundred sixty-one".