2161620342504 has 96 divisors (see below), whose sum is σ = 6701900400000. Its totient is φ = 616574664576.

The previous prime is 2161620342451. The next prime is 2161620342559. The reversal of 2161620342504 is 4052430261612.

2161620342504 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 620 + 3 + 4 + 25 + 0 + 4 = 666.

It is a super-2 number, since 2×2161620342504² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3278179 + ... + 3881970.

It is an arithmetic number, because the mean of its divisors is an integer number (69811462500).

Almost surely, 2^{2161620342504} is an apocalyptic number.

2161620342504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2161620342504 is an abundant number, since it is smaller than the sum of its proper divisors (4540280057496).

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

2161620342504 is a wasteful number, since it uses less digits than its factorization.

2161620342504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7160767 (or 7160760 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 2161620342504 in words is "two trillion, one hundred sixty-one billion, six hundred twenty million, three hundred forty-two thousand, five hundred four".