11701997563 has 4 divisors (see below), whose sum is σ = 11702258200. Its totient is φ = 11701736928.

The previous prime is 11701997543. The next prime is 11701997633. The reversal of 11701997563 is 36579910711.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11701997563 - 2²¹ = 11699900411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11701997513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43845 + ... + 159142.

It is an arithmetic number, because the mean of its divisors is an integer number (2925564550).

Almost surely, 2^11701997563 is an apocalyptic number.

11701997563 is a deficient number, since it is larger than the sum of its proper divisors (260637).

11701997563 is an equidigital number, since it uses as much as digits as its factorization.

11701997563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260636.

The product of its (nonzero) digits is 357210, while the sum is 49.

The spelling of 11701997563 in words is "eleven billion, seven hundred one million, nine hundred ninety-seven thousand, five hundred sixty-three".