8154966561 has 24 divisors (see below), whose sum is σ = 12701496960. Its totient is φ = 4640463072.

The previous prime is 8154966557. The next prime is 8154966581. The reversal of 8154966561 is 1656694518.

It is not a de Polignac number, because 8154966561 - 2² = 8154966557 is a prime.

It is a super-2 number, since 2×8154966561² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8154966581) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80926 + ... + 151191.

It is an arithmetic number, because the mean of its divisors is an integer number (529229040).

Almost surely, 2^8154966561 is an apocalyptic number.

It is an amenable number.

8154966561 is a deficient number, since it is larger than the sum of its proper divisors (4546530399).

8154966561 is a wasteful number, since it uses less digits than its factorization.

8154966561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232373 (or 232366 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 51.

The square root of 8154966561 is about 90304.8534742181. The cubic root of 8154966561 is about 2012.8313818520.

The spelling of 8154966561 in words is "eight billion, one hundred fifty-four million, nine hundred sixty-six thousand, five hundred sixty-one".