651291750021 has 64 divisors (see below), whose sum is σ = 1089911808000. Its totient is φ = 340597094400.

The previous prime is 651291750001. The next prime is 651291750037. The reversal of 651291750021 is 120057192156.

It is not a de Polignac number, because 651291750021 - 2⁹ = 651291749509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651291750001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 655096 + ... + 1315953.

It is an arithmetic number, because the mean of its divisors is an integer number (17029872000).

Almost surely, 2^651291750021 is an apocalyptic number.

It is an amenable number.

651291750021 is a deficient number, since it is larger than the sum of its proper divisors (438620057979).

651291750021 is a wasteful number, since it uses less digits than its factorization.

651291750021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971130.

The product of its (nonzero) digits is 37800, while the sum is 39.

The spelling of 651291750021 in words is "six hundred fifty-one billion, two hundred ninety-one million, seven hundred fifty thousand, twenty-one".