1621723617162 has 36 divisors (see below), whose sum is σ = 3862204046610. Its totient is φ = 491431398480.

The previous prime is 1621723617149. The next prime is 1621723617193. The reversal of 1621723617162 is 2617163271261.

1621723617162 is a `hidden beast` number, since 1 + 6 + 2 + 1 + 7 + 23 + 617 + 1 + 6 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1365231001761 + 256492615401 = 1168431^2 + 506451^2 .

It is a super-2 number, since 2×1621723617162² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 372294337 + ... + 372298692.

Almost surely, 2^{1621723617162} is an apocalyptic number.

1621723617162 is an abundant number, since it is smaller than the sum of its proper divisors (2240480429448).

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

1621723617162 is a wasteful number, since it uses less digits than its factorization.

1621723617162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744593059 (or 744593045 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The spelling of 1621723617162 in words is "one trillion, six hundred twenty-one billion, seven hundred twenty-three million, six hundred seventeen thousand, one hundred sixty-two".