19969951454 has 4 divisors (see below), whose sum is σ = 29954927184. Its totient is φ = 9984975726.

The previous prime is 19969951447. The next prime is 19969951481. The reversal of 19969951454 is 45415996991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45415996991 = 31 ⋅1465032161.

It is a super-2 number, since 2×19969951454² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4992487862 + ... + 4992487865.

It is an arithmetic number, because the mean of its divisors is an integer number (7488731796).

Almost surely, 2^19969951454 is an apocalyptic number.

19969951454 is a deficient number, since it is larger than the sum of its proper divisors (9984975730).

19969951454 is an equidigital number, since it uses as much as digits as its factorization.

19969951454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9984975729.

The product of its digits is 15746400, while the sum is 62.

The spelling of 19969951454 in words is "nineteen billion, nine hundred sixty-nine million, nine hundred fifty-one thousand, four hundred fifty-four".