11667163721 has 4 divisors (see below), whose sum is σ = 11667984000. Its totient is φ = 11666343444.

The previous prime is 11667163663. The next prime is 11667163759. The reversal of 11667163721 is 12736176611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11667163721 - 2¹⁴ = 11667147337 is a prime.

It is a super-2 number, since 2×11667163721² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11667163771) 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, 388421 + ... + 417378.

It is an arithmetic number, because the mean of its divisors is an integer number (2916996000).

Almost surely, 2^11667163721 is an apocalyptic number.

It is an amenable number.

11667163721 is a deficient number, since it is larger than the sum of its proper divisors (820279).

11667163721 is an equidigital number, since it uses as much as digits as its factorization.

11667163721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820278.

The product of its digits is 63504, while the sum is 41.

The spelling of 11667163721 in words is "eleven billion, six hundred sixty-seven million, one hundred sixty-three thousand, seven hundred twenty-one".