199623147520 has 128 divisors (see below), whose sum is σ = 480298150800. Its totient is φ = 79647735808.

The previous prime is 199623147499. The next prime is 199623147557. The reversal of 199623147520 is 25741326991.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76511976 + ... + 76514584.

Almost surely, 2^199623147520 is an apocalyptic number.

199623147520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199623147520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240149075400).

199623147520 is an abundant number, since it is smaller than the sum of its proper divisors (280675003280).

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

199623147520 is an frugal number, since it uses more digits than its factorization.

199623147520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3111 (or 3083 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 199623147520 in words is "one hundred ninety-nine billion, six hundred twenty-three million, one hundred forty-seven thousand, five hundred twenty".