6615167121 has 6 divisors (see below), whose sum is σ = 9555241410. Its totient is φ = 4410111408.

The previous prime is 6615167113. The next prime is 6615167123. The reversal of 6615167121 is 1217615166.

It is a happy number.

6615167121 is a `hidden beast` number, since 6 + 615 + 16 + 7 + 1 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6544001025 + 71166096 = 80895^2 + 8436^2 .

It is not a de Polignac number, because 6615167121 - 2³ = 6615167113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6615167123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 367509276 + ... + 367509293.

It is an arithmetic number, because the mean of its divisors is an integer number (1592540235).

Almost surely, 2^6615167121 is an apocalyptic number.

It is an amenable number.

6615167121 is a deficient number, since it is larger than the sum of its proper divisors (2940074289).

6615167121 is a wasteful number, since it uses less digits than its factorization.

6615167121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735018575 (or 735018572 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 6615167121 is about 81333.6776556919. The cubic root of 6615167121 is about 1877.2132320408.

The spelling of 6615167121 in words is "six billion, six hundred fifteen million, one hundred sixty-seven thousand, one hundred twenty-one".