649187375481 has 12 divisors (see below), whose sum is σ = 938711619300. Its totient is φ = 432331650720.

The previous prime is 649187375401. The next prime is 649187375483. The reversal of 649187375481 is 184573781946.

649187375481 is a `hidden beast` number, since 6 + 4 + 9 + 1 + 87 + 3 + 7 + 548 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 437602095225 + 211585280256 = 661515^2 + 459984^2 .

It is not a de Polignac number, because 649187375481 - 2¹³ = 649187367289 is a prime.

It is a super-2 number, since 2×649187375481² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (649187375483) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38318806 + ... + 38335743.

It is an arithmetic number, because the mean of its divisors is an integer number (78225968275).

Almost surely, 2^649187375481 is an apocalyptic number.

It is an amenable number.

649187375481 is a deficient number, since it is larger than the sum of its proper divisors (289524243819).

649187375481 is a wasteful number, since it uses less digits than its factorization.

649187375481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76655496 (or 76655493 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 63.

The spelling of 649187375481 in words is "six hundred forty-nine billion, one hundred eighty-seven million, three hundred seventy-five thousand, four hundred eighty-one".