651233261020 has 48 divisors (see below), whose sum is σ = 1371605114880. Its totient is φ = 259728938816.

The previous prime is 651233261017. The next prime is 651233261033. The reversal of 651233261020 is 20162332156.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27096729 + ... + 27120751.

It is an arithmetic number, because the mean of its divisors is an integer number (28575106560).

Almost surely, 2^651233261020 is an apocalyptic number.

It is an amenable number.

651233261020 is an abundant number, since it is smaller than the sum of its proper divisors (720371853860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

651233261020 is a wasteful number, since it uses less digits than its factorization.

651233261020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27954 (or 27952 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

Adding to 651233261020 its reverse (20162332156), we get a palindrome (671395593176).

The spelling of 651233261020 in words is "six hundred fifty-one billion, two hundred thirty-three million, two hundred sixty-one thousand, twenty".