651996845 has 4 divisors (see below), whose sum is σ = 782396220. Its totient is φ = 521597472.

The previous prime is 651996827. The next prime is 651996859. The reversal of 651996845 is 548699156.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 177715561 + 474281284 = 13331^2 + 21778^2 .

It is a cyclic number.

It is not a de Polignac number, because 651996845 - 2²² = 647802541 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65199680 + ... + 65199689.

It is an arithmetic number, because the mean of its divisors is an integer number (195599055).

Almost surely, 2^651996845 is an apocalyptic number.

It is an amenable number.

651996845 is a deficient number, since it is larger than the sum of its proper divisors (130399375).

651996845 is a wasteful number, since it uses less digits than its factorization.

651996845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130399374.

The product of its digits is 2332800, while the sum is 53.

The square root of 651996845 is about 25534.2288898647. The cubic root of 651996845 is about 867.1252473636.

The spelling of 651996845 in words is "six hundred fifty-one million, nine hundred ninety-six thousand, eight hundred forty-five".