11945999161 has 8 divisors (see below), whose sum is σ = 12651185664. Its totient is φ = 11241088320.

The previous prime is 11945999147. The next prime is 11945999171. The reversal of 11945999161 is 16199954911.

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

It is a cyclic number.

It is not a de Polignac number, because 11945999161 - 2⁵ = 11945999129 is a prime.

It is a super-2 number, since 2×11945999161² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11945999171) 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, 23896 + ... + 156406.

It is an arithmetic number, because the mean of its divisors is an integer number (1581398208).

Almost surely, 2^11945999161 is an apocalyptic number.

It is an amenable number.

11945999161 is a deficient number, since it is larger than the sum of its proper divisors (705186503).

11945999161 is a wasteful number, since it uses less digits than its factorization.

11945999161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137831.

The product of its digits is 787320, while the sum is 55.

The spelling of 11945999161 in words is "eleven billion, nine hundred forty-five million, nine hundred ninety-nine thousand, one hundred sixty-one".