19959156455 has 32 divisors (see below), whose sum is σ = 27566199936. Its totient is φ = 13589743104.

The previous prime is 19959156389. The next prime is 19959156479. The reversal of 19959156455 is 55465195991.

It is a happy number.

It is not a de Polignac number, because 19959156455 - 2⁸ = 19959156199 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19959156394 and 19959156403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3837917 + ... + 3843113.

It is an arithmetic number, because the mean of its divisors is an integer number (861443748).

Almost surely, 2^19959156455 is an apocalyptic number.

19959156455 is a deficient number, since it is larger than the sum of its proper divisors (7607043481).

19959156455 is a wasteful number, since it uses less digits than its factorization.

19959156455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5963.

The product of its digits is 10935000, while the sum is 59.

The spelling of 19959156455 in words is "nineteen billion, nine hundred fifty-nine million, one hundred fifty-six thousand, four hundred fifty-five".