651943643 has 4 divisors (see below), whose sum is σ = 702093168. Its totient is φ = 601794120.

The previous prime is 651943603. The next prime is 651943657. The reversal of 651943643 is 346349156.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-651943643 is a prime.

It is a super-2 number, since 2×651943643² = 850061027296222898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 651943643.

It is not an unprimeable number, because it can be changed into a prime (651943603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25074743 + ... + 25074768.

It is an arithmetic number, because the mean of its divisors is an integer number (175523292).

Almost surely, 2^651943643 is an apocalyptic number.

651943643 is a deficient number, since it is larger than the sum of its proper divisors (50149525).

651943643 is a wasteful number, since it uses less digits than its factorization.

651943643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50149524.

The product of its digits is 233280, while the sum is 41.

The square root of 651943643 is about 25533.1870905298. The cubic root of 651943643 is about 867.1016613331.

The spelling of 651943643 in words is "six hundred fifty-one million, nine hundred forty-three thousand, six hundred forty-three".