651836989438 has 4 divisors (see below), whose sum is σ = 977755484160. Its totient is φ = 325918494718.

The previous prime is 651836989417. The next prime is 651836989459. The reversal of 651836989438 is 834989638156.

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

It is an interprime number because it is at equal distance from previous prime (651836989417) and next prime (651836989459).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162959247358 + ... + 162959247361.

It is an arithmetic number, because the mean of its divisors is an integer number (244438871040).

Almost surely, 2^651836989438 is an apocalyptic number.

651836989438 is a deficient number, since it is larger than the sum of its proper divisors (325918494722).

651836989438 is a wasteful number, since it uses less digits than its factorization.

651836989438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325918494721.

The product of its digits is 268738560, while the sum is 70.

The spelling of 651836989438 in words is "six hundred fifty-one billion, eight hundred thirty-six million, nine hundred eighty-nine thousand, four hundred thirty-eight".