649148665 has 32 divisors (see below), whose sum is σ = 894281472. Its totient is φ = 451475200.

The previous prime is 649148659. The next prime is 649148671. The reversal of 649148665 is 566841946.

It is an interprime number because it is at equal distance from previous prime (649148659) and next prime (649148671).

It is not a de Polignac number, because 649148665 - 2¹³ = 649140473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150945 + ... + 155185.

It is an arithmetic number, because the mean of its divisors is an integer number (27946296).

Almost surely, 2^649148665 is an apocalyptic number.

It is an amenable number.

649148665 is a deficient number, since it is larger than the sum of its proper divisors (245132807).

649148665 is a wasteful number, since it uses less digits than its factorization.

649148665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4302 (or 4280 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 49.

The square root of 649148665 is about 25478.3960444923. The cubic root of 649148665 is about 865.8607556666.

The spelling of 649148665 in words is "six hundred forty-nine million, one hundred forty-eight thousand, six hundred sixty-five".