19997583554 has 8 divisors (see below), whose sum is σ = 32303788860. Its totient is φ = 9229653936.

The previous prime is 19997583553. The next prime is 19997583607. The reversal of 19997583554 is 45538579991.

It can be written as a sum of positive squares in 2 ways, for example, as 19984063225 + 13520329 = 141365^2 + 3677^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×19997583554² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19997583553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384568889 + ... + 384568940.

Almost surely, 2^19997583554 is an apocalyptic number.

19997583554 is a deficient number, since it is larger than the sum of its proper divisors (12306205306).

19997583554 is a wasteful number, since it uses less digits than its factorization.

19997583554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769137844.

The product of its digits is 61236000, while the sum is 65.

The spelling of 19997583554 in words is "nineteen billion, nine hundred ninety-seven million, five hundred eighty-three thousand, five hundred fifty-four".