51253181520 has 40 divisors (see below), whose sum is σ = 158884863456. Its totient is φ = 13667515008.

The previous prime is 51253181491. The next prime is 51253181563. The reversal of 51253181520 is 2518135215.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106777222 + ... + 106777701.

Almost surely, 2^51253181520 is an apocalyptic number.

It is an amenable number.

51253181520 is an abundant number, since it is smaller than the sum of its proper divisors (107631681936).

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

51253181520 is a wasteful number, since it uses less digits than its factorization.

51253181520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213554939 (or 213554933 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 33.

The spelling of 51253181520 in words is "fifty-one billion, two hundred fifty-three million, one hundred eighty-one thousand, five hundred twenty".