5156661605 has 4 divisors (see below), whose sum is σ = 6187993932. Its totient is φ = 4125329280.

The previous prime is 5156661581. The next prime is 5156661641. The reversal of 5156661605 is 5061666515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2745655201 + 2411006404 = 52399^2 + 49102^2 .

It is not a de Polignac number, because 5156661605 - 2¹⁶ = 5156596069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515666156 + ... + 515666165.

It is an arithmetic number, because the mean of its divisors is an integer number (1546998483).

Almost surely, 2^5156661605 is an apocalyptic number.

It is an amenable number.

5156661605 is a deficient number, since it is larger than the sum of its proper divisors (1031332327).

5156661605 is a wasteful number, since it uses less digits than its factorization.

5156661605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031332326.

The product of its (nonzero) digits is 162000, while the sum is 41.

The square root of 5156661605 is about 71809.8990738742. The cubic root of 5156661605 is about 1727.6517758110.

The spelling of 5156661605 in words is "five billion, one hundred fifty-six million, six hundred sixty-one thousand, six hundred five".