649644060025 has 9 divisors (see below), whose sum is σ = 805563631693. Its totient is φ = 519712024000.

The previous prime is 649644059957. The next prime is 649644060047. The reversal of 649644060025 is 520060446946.

The square root of 649644060025 is 806005.

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

It can be written as a sum of positive squares in 4 ways, for example, as 173924863849 + 475719196176 = 417043^2 + 689724^2 .

It is not a de Polignac number, because 649644060025 - 2¹⁷ = 649643928953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3949425 + ... + 4110625.

Almost surely, 2^649644060025 is an apocalyptic number.

649644060025 is the 806005-th square number.

649644060025 is the 403003-rd centered octagonal number.

It is an amenable number.

649644060025 is a deficient number, since it is larger than the sum of its proper divisors (155919571668).

649644060025 is an frugal number, since it uses more digits than its factorization.

649644060025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322412 (or 161206 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 46.

The spelling of 649644060025 in words is "six hundred forty-nine billion, six hundred forty-four million, sixty thousand, twenty-five".