2001157112161 has 4 divisors (see below), whose sum is σ = 2065710567424. Its totient is φ = 1936603656900.

The previous prime is 2001157112153. The next prime is 2001157112179. The reversal of 2001157112161 is 1612117511002.

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 2001157112161 - 2³ = 2001157112153 is a prime.

It is a super-3 number, since 3×2001157112161³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001157112191) 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, 32276727585 + ... + 32276727646.

It is an arithmetic number, because the mean of its divisors is an integer number (516427641856).

Almost surely, 2^{2001157112161} is an apocalyptic number.

It is an amenable number.

2001157112161 is a deficient number, since it is larger than the sum of its proper divisors (64553455263).

2001157112161 is an equidigital number, since it uses as much as digits as its factorization.

2001157112161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64553455262.

The product of its (nonzero) digits is 840, while the sum is 28.

The spelling of 2001157112161 in words is "two trillion, one billion, one hundred fifty-seven million, one hundred twelve thousand, one hundred sixty-one".