19995500271 has 16 divisors (see below), whose sum is σ = 27928099584. Its totient is φ = 12701128704.

The previous prime is 19995500267. The next prime is 19995500281. The reversal of 19995500271 is 17200559991.

It is not a de Polignac number, because 19995500271 - 2² = 19995500267 is a prime.

It is a super-2 number, since 2×19995500271² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19995500271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19995500251) 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, 546061 + ... + 581526.

It is an arithmetic number, because the mean of its divisors is an integer number (1745506224).

Almost surely, 2^19995500271 is an apocalyptic number.

19995500271 is a deficient number, since it is larger than the sum of its proper divisors (7932599313).

19995500271 is a wasteful number, since it uses less digits than its factorization.

19995500271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127870.

The product of its (nonzero) digits is 255150, while the sum is 48.

The spelling of 19995500271 in words is "nineteen billion, nine hundred ninety-five million, five hundred thousand, two hundred seventy-one".