5105615661 has 24 divisors (see below), whose sum is σ = 7889112504. Its totient is φ = 3170488320.

The previous prime is 5105615659. The next prime is 5105615689. The reversal of 5105615661 is 1665165015.

It can be written as a sum of positive squares in 4 ways, for example, as 2957293161 + 2148322500 = 54381^2 + 46350^2 .

It is not a de Polignac number, because 5105615661 - 2¹ = 5105615659 is a prime.

It is a super-2 number, since 2×5105615661² = 52134622555696933842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5105615261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157170 + ... + 186851.

It is an arithmetic number, because the mean of its divisors is an integer number (328713021).

Almost surely, 2^5105615661 is an apocalyptic number.

5105615661 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

5105615661 is a deficient number, since it is larger than the sum of its proper divisors (2783496843).

5105615661 is a wasteful number, since it uses less digits than its factorization.

5105615661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344141 (or 344138 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 5105615661 is about 71453.5909594472. The cubic root of 5105615661 is about 1721.9321694236.

The spelling of 5105615661 in words is "five billion, one hundred five million, six hundred fifteen thousand, six hundred sixty-one".