11663651671 has 8 divisors (see below), whose sum is σ = 13330557824. Its totient is φ = 9996913080.

The previous prime is 11663651627. The next prime is 11663651683. The reversal of 11663651671 is 17615636611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11663651671 - 2¹³ = 11663643479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11663651611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201796 + ... + 253078.

It is an arithmetic number, because the mean of its divisors is an integer number (1666319728).

Almost surely, 2^11663651671 is an apocalyptic number.

11663651671 is a deficient number, since it is larger than the sum of its proper divisors (1666906153).

11663651671 is an equidigital number, since it uses as much as digits as its factorization.

11663651671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83781.

The product of its digits is 136080, while the sum is 43.

The spelling of 11663651671 in words is "eleven billion, six hundred sixty-three million, six hundred fifty-one thousand, six hundred seventy-one".