649390066 has 16 divisors (see below), whose sum is σ = 1049759424. Its totient is φ = 299505744.

The previous prime is 649390061. The next prime is 649390067. The reversal of 649390066 is 660093946.

It is not an unprimeable number, because it can be changed into a prime (649390061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32025 + ... + 48211.

It is an arithmetic number, because the mean of its divisors is an integer number (65609964).

Almost surely, 2^649390066 is an apocalyptic number.

649390066 is a deficient number, since it is larger than the sum of its proper divisors (400369358).

649390066 is a wasteful number, since it uses less digits than its factorization.

649390066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17745.

The product of its (nonzero) digits is 209952, while the sum is 43.

The square root of 649390066 is about 25483.1329706534. The cubic root of 649390066 is about 865.9680725055.

The spelling of 649390066 in words is "six hundred forty-nine million, three hundred ninety thousand, sixty-six".