199911123620 has 48 divisors (see below), whose sum is σ = 478701217008. Its totient is φ = 69471375360.

The previous prime is 199911123619. The next prime is 199911123649. The reversal of 199911123620 is 26321119991.

It can be written as a sum of positive squares in 8 ways, for example, as 13798261156 + 186112862464 = 117466^2 + 431408^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22609961 + ... + 22618800.

It is an arithmetic number, because the mean of its divisors is an integer number (9972942021).

Almost surely, 2^199911123620 is an apocalyptic number.

199911123620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199911123620 is an abundant number, since it is smaller than the sum of its proper divisors (278790093388).

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

199911123620 is a wasteful number, since it uses less digits than its factorization.

199911123620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45228800 (or 45228798 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 44.

The spelling of 199911123620 in words is "one hundred ninety-nine billion, nine hundred eleven million, one hundred twenty-three thousand, six hundred twenty".