51511628380 has 48 divisors (see below), whose sum is σ = 111492942624. Its totient is φ = 19978721280.

The previous prime is 51511628341. The next prime is 51511628393. The reversal of 51511628380 is 8382611515.

It is a happy number.

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, 59037 + ... + 326356.

It is an arithmetic number, because the mean of its divisors is an integer number (2322769638).

Almost surely, 2^51511628380 is an apocalyptic number.

It is an amenable number.

51511628380 is an abundant number, since it is smaller than the sum of its proper divisors (59981314244).

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

51511628380 is a wasteful number, since it uses less digits than its factorization.

51511628380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385606 (or 385604 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 40.

The spelling of 51511628380 in words is "fifty-one billion, five hundred eleven million, six hundred twenty-eight thousand, three hundred eighty".