19659340155 has 32 divisors (see below), whose sum is σ = 38713780224. Its totient is φ = 8295808896.

The previous prime is 19659340097. The next prime is 19659340201. The reversal of 19659340155 is 55104395691.

It is not a de Polignac number, because 19659340155 - 2¹⁵ = 19659307387 is a prime.

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, 7199859 + ... + 7202588.

It is an arithmetic number, because the mean of its divisors is an integer number (1209805632).

Almost surely, 2^19659340155 is an apocalyptic number.

19659340155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19659340155 is a deficient number, since it is larger than the sum of its proper divisors (19054440069).

19659340155 is a wasteful number, since it uses less digits than its factorization.

19659340155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14402475.

The product of its (nonzero) digits is 729000, while the sum is 48.

The spelling of 19659340155 in words is "nineteen billion, six hundred fifty-nine million, three hundred forty thousand, one hundred fifty-five".