1613961894724 has 15 divisors (see below), whose sum is σ = 2827981598827. Its totient is φ = 805968424216.

The previous prime is 1613961894683. The next prime is 1613961894749. The reversal of 1613961894724 is 4274981693161.

The square root of 1613961894724 is 1270418.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 1468269124 + 1612493625600 = 38318^2 + 1269840^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=4, B=797.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 4 ways as a sum of consecutive naturals, for example, 2025045894 + ... + 2025046690.

Almost surely, 2^{1613961894724} is an apocalyptic number.

1613961894724 is the 1270418-th square number.

It is an amenable number.

1613961894724 is a deficient number, since it is larger than the sum of its proper divisors (1214019704103).

1613961894724 is an frugal number, since it uses more digits than its factorization.

1613961894724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3192 (or 799 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 61.

The spelling of 1613961894724 in words is "one trillion, six hundred thirteen billion, nine hundred sixty-one million, eight hundred ninety-four thousand, seven hundred twenty-four".