2649644939529 has 27 divisors (see below), whose sum is σ = 4452181928103. Its totient is φ = 1514063289312.

The previous prime is 2649644939521. The next prime is 2649644939531. The reversal of 2649644939529 is 9259394469462.

The square root of 2649644939529 is 1627773.

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

2649644939529 is a `hidden beast` number, since 2 + 6 + 4 + 9 + 6 + 4 + 4 + 93 + 9 + 529 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2543530574025 + 106114365504 = 1594845^2 + 325752^2 .

It is not a de Polignac number, because 2649644939529 - 2³ = 2649644939521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2649644939521) by changing a digit.

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 26 ways as a sum of consecutive naturals, for example, 34144477 + ... + 34221989.

Almost surely, 2^{2649644939529} is an apocalyptic number.

2649644939529 is the 1627773-rd square number.

2649644939529 is the 813887-th centered octagonal number.

It is an amenable number.

2649644939529 is a deficient number, since it is larger than the sum of its proper divisors (1802536988574).

2649644939529 is an frugal number, since it uses more digits than its factorization.

2649644939529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155046 (or 77523 counting only the distinct ones).

The product of its digits is 906992640, while the sum is 72.

The spelling of 2649644939529 in words is "two trillion, six hundred forty-nine billion, six hundred forty-four million, nine hundred thirty-nine thousand, five hundred twenty-nine".