156661668 has 24 divisors (see below), whose sum is σ = 406160160. Its totient is φ = 52220520.

The previous prime is 156661651. The next prime is 156661699. The reversal of 156661668 is 866166651.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725178 + ... + 725393.

It is an arithmetic number, because the mean of its divisors is an integer number (16923340).

Almost surely, 2^156661668 is an apocalyptic number.

156661668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

156661668 is an abundant number, since it is smaller than the sum of its proper divisors (249498492).

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

156661668 is a wasteful number, since it uses less digits than its factorization.

156661668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450584 (or 1450576 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 156661668 is about 12516.4558881498. The cubic root of 156661668 is about 539.0812773346.

The spelling of 156661668 in words is "one hundred fifty-six million, six hundred sixty-one thousand, six hundred sixty-eight".