150721208613 has 6 divisors (see below), whose sum is σ = 217708412454. Its totient is φ = 100480805736.

The previous prime is 150721208609. The next prime is 150721208639. The reversal of 150721208613 is 316802127051.

150721208613 is a `hidden beast` number, since 15 + 0 + 7 + 2 + 1 + 20 + 8 + 613 = 666.

It can be written as a sum of positive squares in only one way, i.e., 86870488644 + 63850719969 = 294738^2 + 252687^2 .

It is not a de Polignac number, because 150721208613 - 2² = 150721208609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (150721208683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8373400470 + ... + 8373400487.

It is an arithmetic number, because the mean of its divisors is an integer number (36284735409).

Almost surely, 2^150721208613 is an apocalyptic number.

It is an amenable number.

150721208613 is a deficient number, since it is larger than the sum of its proper divisors (66987203841).

150721208613 is a wasteful number, since it uses less digits than its factorization.

150721208613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16746800963 (or 16746800960 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 150721208613 in words is "one hundred fifty billion, seven hundred twenty-one million, two hundred eight thousand, six hundred thirteen".