155715151120721 has 16 divisors (see below), whose sum is σ = 161117724672000. Its totient is φ = 150336468224400.

The previous prime is 155715151120679. The next prime is 155715151120741. The reversal of 155715151120721 is 127021151517551.

It is a cyclic number.

It is not a de Polignac number, because 155715151120721 - 2⁶ = 155715151120657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155715151120741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53082380 + ... + 55938978.

It is an arithmetic number, because the mean of its divisors is an integer number (10069857792000).

Almost surely, 2^{155715151120721} is an apocalyptic number.

It is an amenable number.

155715151120721 is a deficient number, since it is larger than the sum of its proper divisors (5402573551279).

155715151120721 is a wasteful number, since it uses less digits than its factorization.

155715151120721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860780.

The product of its (nonzero) digits is 122500, while the sum is 44.

The spelling of 155715151120721 in words is "one hundred fifty-five trillion, seven hundred fifteen billion, one hundred fifty-one million, one hundred twenty thousand, seven hundred twenty-one".