19755647155 has 4 divisors (see below), whose sum is σ = 23706776592. Its totient is φ = 15804517720.

The previous prime is 19755647111. The next prime is 19755647189. The reversal of 19755647155 is 55174655791.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 19755647155 - 2²⁵ = 19722092723 is a prime.

It is a super-3 number, since 3×19755647155³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19755647096 and 19755647105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1975564711 + ... + 1975564720.

It is an arithmetic number, because the mean of its divisors is an integer number (5926694148).

Almost surely, 2^19755647155 is an apocalyptic number.

19755647155 is a deficient number, since it is larger than the sum of its proper divisors (3951129437).

19755647155 is an equidigital number, since it uses as much as digits as its factorization.

19755647155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3951129436.

The product of its digits is 6615000, while the sum is 55.

The spelling of 19755647155 in words is "nineteen billion, seven hundred fifty-five million, six hundred forty-seven thousand, one hundred fifty-five".