651233513551 has 4 divisors (see below), whose sum is σ = 653767496352. Its totient is φ = 648699530752.

The previous prime is 651233513543. The next prime is 651233513633. The reversal of 651233513551 is 155315332156.

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 651233513551 - 2³ = 651233513543 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 (651233513251) 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, 1266991015 + ... + 1266991528.

It is an arithmetic number, because the mean of its divisors is an integer number (163441874088).

Almost surely, 2^651233513551 is an apocalyptic number.

651233513551 is a deficient number, since it is larger than the sum of its proper divisors (2533982801).

651233513551 is a wasteful number, since it uses less digits than its factorization.

651233513551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2533982800.

The product of its digits is 202500, while the sum is 40.

The spelling of 651233513551 in words is "six hundred fifty-one billion, two hundred thirty-three million, five hundred thirteen thousand, five hundred fifty-one".