11111511012 has 48 divisors (see below), whose sum is σ = 29902561920. Its totient is φ = 3145588992.

The previous prime is 11111511007. The next prime is 11111511023. The reversal of 11111511012 is 21011511111.

It is a junction number, because it is equal to n+sod(n) for n = 11111510982 and 11111511000.

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, 597633 + ... + 615944.

It is an arithmetic number, because the mean of its divisors is an integer number (622970040).

Almost surely, 2^11111511012 is an apocalyptic number.

11111511012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11111511012 is an abundant number, since it is smaller than the sum of its proper divisors (18791050908).

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

11111511012 is a wasteful number, since it uses less digits than its factorization.

11111511012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213700 (or 1213698 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 15.

Subtracting 11111511012 from its reverse (21011511111), we obtain a palindrome (9900000099).

The spelling of 11111511012 in words is "eleven billion, one hundred eleven million, five hundred eleven thousand, twelve".