651625002421 has 16 divisors (see below), whose sum is σ = 687645288000. Its totient is φ = 615777942528.

The previous prime is 651625002419. The next prime is 651625002443. The reversal of 651625002421 is 124200526156.

It is a cyclic number.

It is not a de Polignac number, because 651625002421 - 2¹ = 651625002419 is a prime.

It is a super-2 number, since 2×651625002421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651625002521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37297330 + ... + 37314796.

It is an arithmetic number, because the mean of its divisors is an integer number (42977830500).

Almost surely, 2^651625002421 is an apocalyptic number.

It is an amenable number.

651625002421 is a deficient number, since it is larger than the sum of its proper divisors (36020285579).

651625002421 is a wasteful number, since it uses less digits than its factorization.

651625002421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22308.

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 651625002421 its reverse (124200526156), we get a palindrome (775825528577).

The spelling of 651625002421 in words is "six hundred fifty-one billion, six hundred twenty-five million, two thousand, four hundred twenty-one".