649769165 has 16 divisors (see below), whose sum is σ = 789568560. Its totient is φ = 513285120.

The previous prime is 649769161. The next prime is 649769179. The reversal of 649769165 is 561967946.

It can be written as a sum of positive squares in 8 ways, for example, as 46280809 + 603488356 = 6803^2 + 24566^2 .

It is not a de Polignac number, because 649769165 - 2² = 649769161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649769161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170885 + ... + 174645.

It is an arithmetic number, because the mean of its divisors is an integer number (49348035).

Almost surely, 2^649769165 is an apocalyptic number.

It is an amenable number.

649769165 is a deficient number, since it is larger than the sum of its proper divisors (139799395).

649769165 is a wasteful number, since it uses less digits than its factorization.

649769165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4192.

The product of its digits is 2449440, while the sum is 53.

The square root of 649769165 is about 25490.5701191637. The cubic root of 649769165 is about 866.1365504799.

The spelling of 649769165 in words is "six hundred forty-nine million, seven hundred sixty-nine thousand, one hundred sixty-five".