2161641631156 has 48 divisors (see below), whose sum is σ = 4701312838656. Its totient is φ = 848357190144.

The previous prime is 2161641631153. The next prime is 2161641631213. The reversal of 2161641631156 is 6511361461612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161641631153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61350820 + ... + 61386043.

It is an arithmetic number, because the mean of its divisors is an integer number (97944017472).

Almost surely, 2^{2161641631156} is an apocalyptic number.

It is an amenable number.

2161641631156 is an abundant number, since it is smaller than the sum of its proper divisors (2539671207500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161641631156 is a wasteful number, since it uses less digits than its factorization.

2161641631156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122736928 (or 122736926 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The spelling of 2161641631156 in words is "two trillion, one hundred sixty-one billion, six hundred forty-one million, six hundred thirty-one thousand, one hundred fifty-six".