651256066 has 4 divisors (see below), whose sum is σ = 976884102. Its totient is φ = 325628032.

The previous prime is 651256057. The next prime is 651256087. The reversal of 651256066 is 660652156.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 495730225 + 155525841 = 22265^2 + 12471^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162814015 + ... + 162814018.

Almost surely, 2^651256066 is an apocalyptic number.

651256066 is a deficient number, since it is larger than the sum of its proper divisors (325628036).

651256066 is a wasteful number, since it uses less digits than its factorization.

651256066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325628035.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 651256066 is about 25519.7191598967. The cubic root of 651256066 is about 866.7967224612.

The spelling of 651256066 in words is "six hundred fifty-one million, two hundred fifty-six thousand, sixty-six".