8156660655 has 64 divisors (see below), whose sum is σ = 15362016768. Its totient is φ = 3643445760.

The previous prime is 8156660647. The next prime is 8156660657. The reversal of 8156660655 is 5560666518.

It is not a de Polignac number, because 8156660655 - 2³ = 8156660647 is a prime.

It is a super-2 number, since 2×8156660655² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8156660657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1191352 + ... + 1198178.

It is an arithmetic number, because the mean of its divisors is an integer number (240031512).

Almost surely, 2^8156660655 is an apocalyptic number.

8156660655 is a deficient number, since it is larger than the sum of its proper divisors (7205356113).

8156660655 is a wasteful number, since it uses less digits than its factorization.

8156660655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7416.

The product of its (nonzero) digits is 1296000, while the sum is 48.

The square root of 8156660655 is about 90314.2328484276. The cubic root of 8156660655 is about 2012.9707525224.

The spelling of 8156660655 in words is "eight billion, one hundred fifty-six million, six hundred sixty thousand, six hundred fifty-five".