2161619964923 has 8 divisors (see below), whose sum is σ = 2190921201600. Its totient is φ = 2132367202368.

The previous prime is 2161619964919. The next prime is 2161619964943. The reversal of 2161619964923 is 3294699161612.

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 2161619964923 - 2² = 2161619964919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161619964943) 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, 12028736 + ... + 12207117.

It is an arithmetic number, because the mean of its divisors is an integer number (273865150200).

Almost surely, 2^{2161619964923} is an apocalyptic number.

2161619964923 is a deficient number, since it is larger than the sum of its proper divisors (29301236677).

2161619964923 is a wasteful number, since it uses less digits than its factorization.

2161619964923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24237061.

The product of its digits is 7558272, while the sum is 59.

The spelling of 2161619964923 in words is "two trillion, one hundred sixty-one billion, six hundred nineteen million, nine hundred sixty-four thousand, nine hundred twenty-three".