191665019480 has 32 divisors (see below), whose sum is σ = 470450503440. Its totient is φ = 69696370560.

The previous prime is 191665019459. The next prime is 191665019489. The reversal of 191665019480 is 84910566191.

191665019480 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191665019489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217800719 + ... + 217801598.

Almost surely, 2^191665019480 is an apocalyptic number.

191665019480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191665019480 is an abundant number, since it is smaller than the sum of its proper divisors (278785483960).

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

191665019480 is a wasteful number, since it uses less digits than its factorization.

191665019480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435602339 (or 435602335 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 50.

Subtracting from 191665019480 its reverse (84910566191), we obtain a square (106754453289 = 326733²).

The spelling of 191665019480 in words is "one hundred ninety-one billion, six hundred sixty-five million, nineteen thousand, four hundred eighty".