15672944634649 has 9 divisors (see below), whose sum is σ = 15739205576511. Its totient is φ = 15606961531680.

The previous prime is 15672944634631. The next prime is 15672944634653. The reversal of 15672944634649 is 94643644927651.

The square root of 15672944634649 is 3958907.

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., 11787157497049 + 3885787137600 = 3433243^2 + 1971240^2 .

It is not a de Polignac number, because 15672944634649 - 2¹³ = 15672944626457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15672144634649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 954088374 + ... + 954104800.

Almost surely, 2^{15672944634649} is an apocalyptic number.

15672944634649 is the 3958907-th square number.

15672944634649 is the 1979454-th centered octagonal number.

It is an amenable number.

15672944634649 is a deficient number, since it is larger than the sum of its proper divisors (66260941862).

15672944634649 is an frugal number, since it uses more digits than its factorization.

15672944634649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33336 (or 16668 counting only the distinct ones).

The product of its digits is 940584960, while the sum is 70.

The spelling of 15672944634649 in words is "fifteen trillion, six hundred seventy-two billion, nine hundred forty-four million, six hundred thirty-four thousand, six hundred forty-nine".