651621512125 has 16 divisors (see below), whose sum is σ = 814980142080. Its totient is φ = 520171251600.

The previous prime is 651621512107. The next prime is 651621512147. The reversal of 651621512125 is 521215126156.

It is not a de Polignac number, because 651621512125 - 2¹⁵ = 651621479357 is a prime.

It is a super-2 number, since 2×651621512125² (a number of 24 digits) contains 22 as substring.

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, 5571685 + ... + 5687434.

It is an arithmetic number, because the mean of its divisors is an integer number (50936258880).

Almost surely, 2^651621512125 is an apocalyptic number.

It is an amenable number.

651621512125 is a deficient number, since it is larger than the sum of its proper divisors (163358629955).

651621512125 is a wasteful number, since it uses less digits than its factorization.

651621512125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11259597 (or 11259587 counting only the distinct ones).

The product of its digits is 36000, while the sum is 37.

The spelling of 651621512125 in words is "six hundred fifty-one billion, six hundred twenty-one million, five hundred twelve thousand, one hundred twenty-five".