19719904755 has 16 divisors (see below), whose sum is σ = 31577888160. Its totient is φ = 10508602368.

The previous prime is 19719904723. The next prime is 19719904759. The reversal of 19719904755 is 55740991791.

It is a happy number.

It is not a de Polignac number, because 19719904755 - 2⁵ = 19719904723 is a prime.

It is a super-2 number, since 2×19719904755² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19719904695 and 19719904704.

It is not an unprimeable number, because it can be changed into a prime (19719904759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 523710 + ... + 560099.

It is an arithmetic number, because the mean of its divisors is an integer number (1973618010).

Almost surely, 2^19719904755 is an apocalyptic number.

19719904755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19719904755 is a deficient number, since it is larger than the sum of its proper divisors (11857983405).

19719904755 is a wasteful number, since it uses less digits than its factorization.

19719904755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085030.

The product of its (nonzero) digits is 3572100, while the sum is 57.

The spelling of 19719904755 in words is "nineteen billion, seven hundred nineteen million, nine hundred four thousand, seven hundred fifty-five".