19953001266 has 64 divisors (see below), whose sum is σ = 44555857920. Its totient is φ = 5905448640.

The previous prime is 19953001261. The next prime is 19953001309. The reversal of 19953001266 is 66210035991.

It is not an unprimeable number, because it can be changed into a prime (19953001261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 767265 + ... + 792843.

It is an arithmetic number, because the mean of its divisors is an integer number (696185280).

Almost surely, 2^19953001266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19953001266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22277928960).

19953001266 is an abundant number, since it is smaller than the sum of its proper divisors (24602856654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19953001266 is a wasteful number, since it uses less digits than its factorization.

19953001266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25871.

The product of its (nonzero) digits is 87480, while the sum is 42.

The spelling of 19953001266 in words is "nineteen billion, nine hundred fifty-three million, one thousand, two hundred sixty-six".