5156640261 has 12 divisors (see below), whose sum is σ = 7840505920. Its totient is φ = 3256825320.

The previous prime is 5156640259. The next prime is 5156640263. The reversal of 5156640261 is 1620466515.

5156640261 is a `hidden beast` number, since 5 + 1 + 5 + 6 + 640 + 2 + 6 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (5156640259) and next prime (5156640263).

It is not a de Polignac number, because 5156640261 - 2¹ = 5156640259 is a prime.

It is a super-3 number, since 3×5156640261³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5156640263) 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, 15077725 + ... + 15078066.

Almost surely, 2^5156640261 is an apocalyptic number.

It is an amenable number.

5156640261 is a deficient number, since it is larger than the sum of its proper divisors (2683865659).

5156640261 is a wasteful number, since it uses less digits than its factorization.

5156640261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30155816 (or 30155813 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 5156640261 is about 71809.7504591124. The cubic root of 5156640261 is about 1727.6493921597.

The spelling of 5156640261 in words is "five billion, one hundred fifty-six million, six hundred forty thousand, two hundred sixty-one".