11521901567 has 12 divisors (see below), whose sum is σ = 12675396888. Its totient is φ = 10465501200.

The previous prime is 11521901537. The next prime is 11521901569. The reversal of 11521901567 is 76510912511.

It is not a de Polignac number, because 11521901567 - 2¹⁰ = 11521900543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11521901567.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11521901569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103517 + ... + 183737.

It is an arithmetic number, because the mean of its divisors is an integer number (1056283074).

Almost surely, 2^11521901567 is an apocalyptic number.

11521901567 is a deficient number, since it is larger than the sum of its proper divisors (1153495321).

11521901567 is a wasteful number, since it uses less digits than its factorization.

11521901567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81430 (or 81419 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 38.

The spelling of 11521901567 in words is "eleven billion, five hundred twenty-one million, nine hundred one thousand, five hundred sixty-seven".