15501115212 has 48 divisors (see below), whose sum is σ = 39997921152. Its totient is φ = 4632958080.

The previous prime is 15501115199. The next prime is 15501115237. The reversal of 15501115212 is 21251110551.

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, 794698 + ... + 813969.

It is an arithmetic number, because the mean of its divisors is an integer number (833290024).

Almost surely, 2^15501115212 is an apocalyptic number.

15501115212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15501115212 is an abundant number, since it is smaller than the sum of its proper divisors (24496805940).

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

15501115212 is a wasteful number, since it uses less digits than its factorization.

15501115212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608758 (or 1608756 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 24.

Adding to 15501115212 its reverse (21251110551), we get a palindrome (36752225763).

The spelling of 15501115212 in words is "fifteen billion, five hundred one million, one hundred fifteen thousand, two hundred twelve".