51456891625 has 16 divisors (see below), whose sum is σ = 64723875840. Its totient is φ = 40841362800.

The previous prime is 51456891623. The next prime is 51456891649. The reversal of 51456891625 is 52619865415.

It is not a de Polignac number, because 51456891625 - 2¹ = 51456891623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51456891623) 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, 1604815 + ... + 1636564.

It is an arithmetic number, because the mean of its divisors is an integer number (4045242240).

Almost surely, 2^51456891625 is an apocalyptic number.

It is an amenable number.

51456891625 is a deficient number, since it is larger than the sum of its proper divisors (13266984215).

51456891625 is a wasteful number, since it uses less digits than its factorization.

51456891625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3241521 (or 3241511 counting only the distinct ones).

The product of its digits is 2592000, while the sum is 52.

The spelling of 51456891625 in words is "fifty-one billion, four hundred fifty-six million, eight hundred ninety-one thousand, six hundred twenty-five".