651793938991 has 4 divisors (see below), whose sum is σ = 701931934312. Its totient is φ = 601655943672.

The previous prime is 651793938967. The next prime is 651793939019. The reversal of 651793938991 is 199839397156.

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 651793938991 - 2⁵ = 651793938959 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 651793938991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651793908991) 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, 25068997641 + ... + 25068997666.

It is an arithmetic number, because the mean of its divisors is an integer number (175482983578).

Almost surely, 2^651793938991 is an apocalyptic number.

651793938991 is a deficient number, since it is larger than the sum of its proper divisors (50137995321).

651793938991 is a wasteful number, since it uses less digits than its factorization.

651793938991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50137995320.

The product of its digits is 99202320, while the sum is 70.

The spelling of 651793938991 in words is "six hundred fifty-one billion, seven hundred ninety-three million, nine hundred thirty-eight thousand, nine hundred ninety-one".