651910940391 has 8 divisors (see below), whose sum is σ = 870736856704. Its totient is φ = 433846158840.

The previous prime is 651910940287. The next prime is 651910940491. The reversal of 651910940391 is 193049019156.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 651910940391 - 2¹⁸ = 651910678247 is a prime.

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 651910940391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651910940491) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 190281691 + ... + 190285116.

It is an arithmetic number, because the mean of its divisors is an integer number (108842107088).

Almost surely, 2^651910940391 is an apocalyptic number.

651910940391 is a deficient number, since it is larger than the sum of its proper divisors (218825916313).

651910940391 is a wasteful number, since it uses less digits than its factorization.

651910940391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380567381.

The product of its (nonzero) digits is 262440, while the sum is 48.

The spelling of 651910940391 in words is "six hundred fifty-one billion, nine hundred ten million, nine hundred forty thousand, three hundred ninety-one".