156121726820 has 12 divisors (see below), whose sum is σ = 327855626364. Its totient is φ = 62448690720.

The previous prime is 156121726811. The next prime is 156121726823. The reversal of 156121726820 is 28627121651.

156121726820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 75529330276 + 80592396544 = 274826^2 + 283888^2 .

It is not an unprimeable number, because it can be changed into a prime (156121726823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3903043151 + ... + 3903043190.

It is an arithmetic number, because the mean of its divisors is an integer number (27321302197).

Almost surely, 2^156121726820 is an apocalyptic number.

156121726820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156121726820 is an abundant number, since it is smaller than the sum of its proper divisors (171733899544).

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

156121726820 is a wasteful number, since it uses less digits than its factorization.

156121726820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7806086350 (or 7806086348 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 156121726820 in words is "one hundred fifty-six billion, one hundred twenty-one million, seven hundred twenty-six thousand, eight hundred twenty".