156221696 has 36 divisors (see below), whose sum is σ = 320280492. Its totient is φ = 75995136.

The previous prime is 156221693. The next prime is 156221707. The reversal of 156221696 is 696122651.

It can be written as a sum of positive squares in 2 ways, for example, as 65286400 + 90935296 = 8080^2 + 9536^2 .

It is a super-2 number, since 2×156221696² = 48810436602232832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (156221693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1226 + ... + 17718.

Almost surely, 2^156221696 is an apocalyptic number.

156221696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 156221696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160140246).

156221696 is an abundant number, since it is smaller than the sum of its proper divisors (164058796).

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

156221696 is an equidigital number, since it uses as much as digits as its factorization.

156221696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16546 (or 16532 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 156221696 is about 12498.8677887239. The cubic root of 156221696 is about 538.5761483470.

The spelling of 156221696 in words is "one hundred fifty-six million, two hundred twenty-one thousand, six hundred ninety-six".