666566665156 has 24 divisors (see below), whose sum is σ = 1338202293120. Its totient is φ = 284585221632.

The previous prime is 666566665153. The next prime is 666566665183. The reversal of 666566665156 is 651566665666.

It is a super-2 number, since 2×666566665156² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666566665153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45251101 + ... + 45265828.

It is an arithmetic number, because the mean of its divisors is an integer number (55758428880).

Almost surely, 2^666566665156 is an apocalyptic number.

It is an amenable number.

666566665156 is an abundant number, since it is smaller than the sum of its proper divisors (671635627964).

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

666566665156 is a wasteful number, since it uses less digits than its factorization.

666566665156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90517203 (or 90517201 counting only the distinct ones).

The product of its digits is 209952000, while the sum is 64.

The spelling of 666566665156 in words is "six hundred sixty-six billion, five hundred sixty-six million, six hundred sixty-five thousand, one hundred fifty-six".