51504215250 has 32 divisors (see below), whose sum is σ = 128554523136. Its totient is φ = 13734457200.

The previous prime is 51504215237. The next prime is 51504215263. The reversal of 51504215250 is 5251240515.

It is an interprime number because it is at equal distance from previous prime (51504215237) and next prime (51504215263).

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

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, 34335394 + ... + 34336893.

It is an arithmetic number, because the mean of its divisors is an integer number (4017328848).

Almost surely, 2^51504215250 is an apocalyptic number.

51504215250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51504215250 is an abundant number, since it is smaller than the sum of its proper divisors (77050307886).

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

51504215250 is a wasteful number, since it uses less digits than its factorization.

51504215250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68672307 (or 68672297 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 30.

Adding to 51504215250 its reverse (5251240515), we get a palindrome (56755455765).

The spelling of 51504215250 in words is "fifty-one billion, five hundred four million, two hundred fifteen thousand, two hundred fifty".