7720256166 has 32 divisors (see below), whose sum is σ = 17665589760. Its totient is φ = 2203376256.

The previous prime is 7720256123. The next prime is 7720256179. The reversal of 7720256166 is 6616520277.

It is a super-2 number, since 2×7720256166² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61411 + ... + 138606.

It is an arithmetic number, because the mean of its divisors is an integer number (552049680).

Almost surely, 2^7720256166 is an apocalyptic number.

7720256166 is an abundant number, since it is smaller than the sum of its proper divisors (9945333594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7720256166 is a wasteful number, since it uses less digits than its factorization.

7720256166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200948.

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 7720256166 is about 87864.9882831609. The cubic root of 7720256166 is about 1976.4108844878.

The spelling of 7720256166 in words is "seven billion, seven hundred twenty million, two hundred fifty-six thousand, one hundred sixty-six".