2161620525623 has 8 divisors (see below), whose sum is σ = 2328384781968. Its totient is φ = 1994925662784.

The previous prime is 2161620525611. The next prime is 2161620525683. The reversal of 2161620525623 is 3265250261612.

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 2161620525623 - 2¹⁴ = 2161620509239 is a prime.

It is a super-3 number, since 3×2161620525623³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161620525683) 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, 17283665 + ... + 17408282.

It is an arithmetic number, because the mean of its divisors is an integer number (291048097746).

Almost surely, 2^{2161620525623} is an apocalyptic number.

2161620525623 is a deficient number, since it is larger than the sum of its proper divisors (166764256345).

2161620525623 is a wasteful number, since it uses less digits than its factorization.

2161620525623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34696753.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 2161620525623 in words is "two trillion, one hundred sixty-one billion, six hundred twenty million, five hundred twenty-five thousand, six hundred twenty-three".