151818550321 has 9 divisors (see below), whose sum is σ = 156886384683. Its totient is φ = 146909488560.

The previous prime is 151818550291. The next prime is 151818550343. The reversal of 151818550321 is 123055818151.

The square root of 151818550321 is 389639.

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

It can be written as a sum of positive squares in only one way, i.e., 150613071921 + 1205478400 = 388089^2 + 34720^2 .

It is a de Polignac number, because none of the positive numbers 2^k-151818550321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151818550021) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12072525 + ... + 12085093.

Almost surely, 2^151818550321 is an apocalyptic number.

151818550321 is the 389639-th square number.

151818550321 is the 194820-th centered octagonal number.

It is an amenable number.

151818550321 is a deficient number, since it is larger than the sum of its proper divisors (5067834362).

151818550321 is an frugal number, since it uses more digits than its factorization.

151818550321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25200 (or 12600 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 40.

The spelling of 151818550321 in words is "one hundred fifty-one billion, eight hundred eighteen million, five hundred fifty thousand, three hundred twenty-one".