19893553527961 has 3 divisors (see below), whose sum is σ = 19893557988181. Its totient is φ = 19893549067742.

The previous prime is 19893553527877. The next prime is 19893553527973. The reversal of 19893553527961 is 16972535539891.

The square root of 19893553527961 is 4460219.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-19893553527961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19893553587961) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2230110 + ... + 6690328.

Almost surely, 2^{19893553527961} is an apocalyptic number.

19893553527961 is the 4460219-th square number.

19893553527961 is the 2230110-th centered octagonal number.

It is an amenable number.

19893553527961 is a deficient number, since it is larger than the sum of its proper divisors (4460220).

19893553527961 is an frugal number, since it uses more digits than its factorization.

19893553527961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8920438 (or 4460219 counting only the distinct ones).

The product of its digits is 551124000, while the sum is 73.

The spelling of 19893553527961 in words is "nineteen trillion, eight hundred ninety-three billion, five hundred fifty-three million, five hundred twenty-seven thousand, nine hundred sixty-one".