51505115000 has 40 divisors (see below), whose sum is σ = 120676496160. Its totient is φ = 20602044000.

The previous prime is 51505114961. The next prime is 51505115003. The reversal of 51505115000 is 51150515.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51505115003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5145512 + ... + 5155511.

It is an arithmetic number, because the mean of its divisors is an integer number (3016912404).

Almost surely, 2^51505115000 is an apocalyptic number.

51505115000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51505115000 is an abundant number, since it is smaller than the sum of its proper divisors (69171381160).

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

51505115000 is a wasteful number, since it uses less digits than its factorization.

51505115000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10301049 (or 10301030 counting only the distinct ones).

The product of its (nonzero) digits is 625, while the sum is 23.

Adding to 51505115000 its reverse (51150515), we get a palindrome (51556265515).

The spelling of 51505115000 in words is "fifty-one billion, five hundred five million, one hundred fifteen thousand".