651255542021 has 24 divisors (see below), whose sum is σ = 794841269760. Its totient is φ = 531355960800.

The previous prime is 651255542017. The next prime is 651255542059. The reversal of 651255542021 is 120245552156.

651255542021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 651255542021 - 2² = 651255542017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651255542011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3421601 + ... + 3606918.

It is an arithmetic number, because the mean of its divisors is an integer number (33118386240).

Almost surely, 2^651255542021 is an apocalyptic number.

651255542021 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

651255542021 is a deficient number, since it is larger than the sum of its proper divisors (143585727739).

651255542021 is a wasteful number, since it uses less digits than its factorization.

651255542021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7028625 (or 7028618 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 38.

The spelling of 651255542021 in words is "six hundred fifty-one billion, two hundred fifty-five million, five hundred forty-two thousand, twenty-one".