51530533500 has 96 divisors (see below), whose sum is σ = 153546801408. Its totient is φ = 13421889600.

The previous prime is 51530533469. The next prime is 51530533511. The reversal of 51530533500 is 533503515.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 334962 + ... + 463961.

It is an arithmetic number, because the mean of its divisors is an integer number (1599445848).

Almost surely, 2^51530533500 is an apocalyptic number.

51530533500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51530533500 is an abundant number, since it is smaller than the sum of its proper divisors (102016267908).

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

51530533500 is a wasteful number, since it uses less digits than its factorization.

51530533500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798988 (or 798976 counting only the distinct ones).

The product of its (nonzero) digits is 16875, while the sum is 30.

The spelling of 51530533500 in words is "fifty-one billion, five hundred thirty million, five hundred thirty-three thousand, five hundred".