1921633445656 has 64 divisors (see below), whose sum is σ = 3745417968000. Its totient is φ = 923182579200.

The previous prime is 1921633445639. The next prime is 1921633445723. The reversal of 1921633445656 is 6565443361291.

It is a super-2 number, since 2×1921633445656² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1921633445597 and 1921633445606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88539606 + ... + 88561306.

It is an arithmetic number, because the mean of its divisors is an integer number (58522155750).

Almost surely, 2^{1921633445656} is an apocalyptic number.

It is an amenable number.

1921633445656 is a deficient number, since it is larger than the sum of its proper divisors (1823784522344).

1921633445656 is a wasteful number, since it uses less digits than its factorization.

1921633445656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23572 (or 23568 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 55.

The spelling of 1921633445656 in words is "one trillion, nine hundred twenty-one billion, six hundred thirty-three million, four hundred forty-five thousand, six hundred fifty-six".