651001646 has 4 divisors (see below), whose sum is σ = 976502472. Its totient is φ = 325500822.

The previous prime is 651001609. The next prime is 651001651. The reversal of 651001646 is 646100156.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162750410 + ... + 162750413.

It is an arithmetic number, because the mean of its divisors is an integer number (244125618).

Almost surely, 2^651001646 is an apocalyptic number.

651001646 is a deficient number, since it is larger than the sum of its proper divisors (325500826).

651001646 is a wasteful number, since it uses less digits than its factorization.

651001646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325500825.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 651001646 is about 25514.7339002389. The cubic root of 651001646 is about 866.6838333549.

The spelling of 651001646 in words is "six hundred fifty-one million, one thousand, six hundred forty-six".