51211645125040 has 80 divisors (see below), whose sum is σ = 122285658502656. Its totient is φ = 19934439033600.

The previous prime is 51211645125031. The next prime is 51211645125049. The reversal of 51211645125040 is 4052154611215.

It is an interprime number because it is at equal distance from previous prime (51211645125031) and next prime (51211645125049).

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (51211645125049) 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, 26534746 + ... + 28399225.

Almost surely, 2^{51211645125040} is an apocalyptic number.

It is an amenable number.

51211645125040 is an abundant number, since it is smaller than the sum of its proper divisors (71074013377616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51211645125040 is a wasteful number, since it uses less digits than its factorization.

51211645125040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54934298 (or 54934292 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 37.

Adding to 51211645125040 its reverse (4052154611215), we get a palindrome (55263799736255).

The spelling of 51211645125040 in words is "fifty-one trillion, two hundred eleven billion, six hundred forty-five million, one hundred twenty-five thousand, forty".