11511415542 has 64 divisors (see below), whose sum is σ = 25768523520. Its totient is φ = 3398707200.

The previous prime is 11511415541. The next prime is 11511415571. The reversal of 11511415542 is 24551411511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11511415541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 426942 + ... + 453102.

It is an arithmetic number, because the mean of its divisors is an integer number (402633180).

Almost surely, 2^11511415542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11511415542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12884261760).

11511415542 is an abundant number, since it is smaller than the sum of its proper divisors (14257107978).

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

11511415542 is a wasteful number, since it uses less digits than its factorization.

11511415542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26349.

The product of its digits is 4000, while the sum is 30.

The spelling of 11511415542 in words is "eleven billion, five hundred eleven million, four hundred fifteen thousand, five hundred forty-two".