7668857655 has 72 divisors (see below), whose sum is σ = 14250397824. Its totient is φ = 3957595200.

The previous prime is 7668857629. The next prime is 7668857663. The reversal of 7668857655 is 5567588667.

It is a happy number.

7668857655 is a `hidden beast` number, since 7 + 6 + 6 + 8 + 8 + 576 + 55 = 666.

It is not a de Polignac number, because 7668857655 - 2²¹ = 7666760503 is a prime.

It is a super-2 number, since 2×7668857655² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7668857592 and 7668857601.

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 1013185 + ... + 1020725.

It is an arithmetic number, because the mean of its divisors is an integer number (197922192).

Almost surely, 2^7668857655 is an apocalyptic number.

7668857655 is a deficient number, since it is larger than the sum of its proper divisors (6581540169).

7668857655 is an frugal number, since it uses more digits than its factorization.

7668857655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7601 (or 7580 counting only the distinct ones).

The product of its digits is 84672000, while the sum is 63.

The square root of 7668857655 is about 87572.0141083897. The cubic root of 7668857655 is about 1972.0150523197.

The spelling of 7668857655 in words is "seven billion, six hundred sixty-eight million, eight hundred fifty-seven thousand, six hundred fifty-five".