815166906 has 16 divisors (see below), whose sum is σ = 1674397344. Its totient is φ = 264378384.

The previous prime is 815166901. The next prime is 815166923. The reversal of 815166906 is 609661518.

It is a happy number.

It is a super-2 number, since 2×815166906² = 1328994169275225672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (815166901) 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, 1835740 + ... + 1836183.

It is an arithmetic number, because the mean of its divisors is an integer number (104649834).

Almost surely, 2^815166906 is an apocalyptic number.

815166906 is an abundant number, since it is smaller than the sum of its proper divisors (859230438).

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

815166906 is a wasteful number, since it uses less digits than its factorization.

815166906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3671965.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 815166906 is about 28551.1279286826. The cubic root of 815166906 is about 934.1476235748.

It can be divided in two parts, 8151 and 66906, that added together give a palindrome (75057).

The spelling of 815166906 in words is "eight hundred fifteen million, one hundred sixty-six thousand, nine hundred six".