199574521920 has 672 divisors, whose sum is σ = 753230050560. Its totient is φ = 49733959680.

The previous prime is 199574521873. The next prime is 199574521957. The reversal of 199574521920 is 29125475991.

It is a happy number.

199574521920 is a `hidden beast` number, since 1 + 9 + 9 + 574 + 52 + 19 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 641718565 + ... + 641718875.

Almost surely, 2^199574521920 is an apocalyptic number.

199574521920 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 199574521920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (376615025280).

199574521920 is an abundant number, since it is smaller than the sum of its proper divisors (553655528640).

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

199574521920 is a wasteful number, since it uses less digits than its factorization.

199574521920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628 (or 595 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 54.

The spelling of 199574521920 in words is "one hundred ninety-nine billion, five hundred seventy-four million, five hundred twenty-one thousand, nine hundred twenty".