157121521615 has 24 divisors (see below), whose sum is σ = 197742830688. Its totient is φ = 119624472000.

The previous prime is 157121521591. The next prime is 157121521621. The reversal of 157121521615 is 516125121751.

157121521615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 157121521615 - 2¹¹ = 157121519567 is a prime.

It is a super-2 number, since 2×157121521615² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 4536865 + ... + 4571365.

It is an arithmetic number, because the mean of its divisors is an integer number (8239284612).

Almost surely, 2^157121521615 is an apocalyptic number.

157121521615 is a deficient number, since it is larger than the sum of its proper divisors (40621309073).

157121521615 is an equidigital number, since it uses as much as digits as its factorization.

157121521615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34927 (or 34728 counting only the distinct ones).

The product of its digits is 21000, while the sum is 37.

The spelling of 157121521615 in words is "one hundred fifty-seven billion, one hundred twenty-one million, five hundred twenty-one thousand, six hundred fifteen".