51128206470840 has 64 divisors (see below), whose sum is σ = 154592372367360. Its totient is φ = 13526832574080.

The previous prime is 51128206470821. The next prime is 51128206470841. The reversal of 51128206470840 is 4807460282115.

It is a happy number.

It is a super-2 number, since 2×51128206470840² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51128206470840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51128206470841) 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, 1677419356 + ... + 1677449835.

It is an arithmetic number, because the mean of its divisors is an integer number (2415505818240).

Almost surely, 2^{51128206470840} is an apocalyptic number.

It is an amenable number.

51128206470840 is an abundant number, since it is smaller than the sum of its proper divisors (103464165896520).

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

51128206470840 is a wasteful number, since it uses less digits than its factorization.

51128206470840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3354869332 (or 3354869328 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 48.

The spelling of 51128206470840 in words is "fifty-one trillion, one hundred twenty-eight billion, two hundred six million, four hundred seventy thousand, eight hundred forty".