156166286215801 has 27 divisors (see below), whose sum is σ = 164010732045069. Its totient is φ = 148690552151232.

The previous prime is 156166286215787. The next prime is 156166286215837. The reversal of 156166286215801 is 108512682661651.

The square root of 156166286215801 is 12496651.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1324996677225 + 154841289538576 = 1151085^2 + 12443524^2 .

It is not a de Polignac number, because 156166286215801 - 2¹¹ = 156166286213753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156166286215871) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 26455407216 + ... + 26455413118.

Almost surely, 2^{156166286215801} is an apocalyptic number.

156166286215801 is the 12496651-st square number.

156166286215801 is the 6248326-th centered octagonal number.

It is an amenable number.

156166286215801 is a deficient number, since it is larger than the sum of its proper divisors (7844445829268).

156166286215801 is an frugal number, since it uses more digits than its factorization.

156166286215801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12010 (or 6005 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 58.

The spelling of 156166286215801 in words is "one hundred fifty-six trillion, one hundred sixty-six billion, two hundred eighty-six million, two hundred fifteen thousand, eight hundred one".