15215374674721 has 15 divisors (see below), whose sum is σ = 16483992350063. Its totient is φ = 14044352730720.

The previous prime is 15215374674691. The next prime is 15215374674761. The reversal of 15215374674721 is 12747647351251.

The square root of 15215374674721 is 3900689.

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

It can be written as a sum of positive squares in 7 ways, for example, as 15214376114721 + 998560000 = 3900561^2 + 31600^2 .

It is not a de Polignac number, because 15215374674721 - 2³¹ = 15213227191073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15215374674761) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 659204901 + ... + 659227981.

Almost surely, 2^{15215374674721} is an apocalyptic number.

15215374674721 is the 3900689-th square number.

15215374674721 is the 1950345-th centered octagonal number.

It is an amenable number.

15215374674721 is a deficient number, since it is larger than the sum of its proper divisors (1268617675342).

15215374674721 is an frugal number, since it uses more digits than its factorization.

15215374674721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46214 (or 23094 counting only the distinct ones).

The product of its digits is 9878400, while the sum is 55.

The spelling of 15215374674721 in words is "fifteen trillion, two hundred fifteen billion, three hundred seventy-four million, six hundred seventy-four thousand, seven hundred twenty-one".