651340448639 has 4 divisors (see below), whose sum is σ = 662380117320. Its totient is φ = 640300779960.

The previous prime is 651340448573. The next prime is 651340448677. The reversal of 651340448639 is 936844043156.

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

It is a cyclic number.

It is not a de Polignac number, because 651340448639 - 2⁸ = 651340448383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651340448039) 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, 5519834252 + ... + 5519834369.

It is an arithmetic number, because the mean of its divisors is an integer number (165595029330).

Almost surely, 2^651340448639 is an apocalyptic number.

651340448639 is a deficient number, since it is larger than the sum of its proper divisors (11039668681).

651340448639 is a wasteful number, since it uses less digits than its factorization.

651340448639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11039668680.

The product of its (nonzero) digits is 7464960, while the sum is 53.

The spelling of 651340448639 in words is "six hundred fifty-one billion, three hundred forty million, four hundred forty-eight thousand, six hundred thirty-nine".