11638017523 has 6 divisors (see below), whose sum is σ = 12792201212. Its totient is φ = 10580015820.

The previous prime is 11638017499. The next prime is 11638017529. The reversal of 11638017523 is 32571083611.

It is not a de Polignac number, because 11638017523 - 2⁹ = 11638017011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11638017529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48090861 + ... + 48091102.

Almost surely, 2^11638017523 is an apocalyptic number.

11638017523 is a deficient number, since it is larger than the sum of its proper divisors (1154183689).

11638017523 is an equidigital number, since it uses as much as digits as its factorization.

11638017523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96181985 (or 96181974 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

It can be divided in two parts, 116380 and 17523, that added together give a triangular number (133903 = T₅₁₇).

The spelling of 11638017523 in words is "eleven billion, six hundred thirty-eight million, seventeen thousand, five hundred twenty-three".