199656402740 has 12 divisors (see below), whose sum is σ = 419278445796. Its totient is φ = 79862561088.

The previous prime is 199656402739. The next prime is 199656402761. The reversal of 199656402740 is 47204656991.

It can be written as a sum of positive squares in 2 ways, for example, as 95717221924 + 103939180816 = 309382^2 + 322396^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4991410049 + ... + 4991410088.

It is an arithmetic number, because the mean of its divisors is an integer number (34939870483).

Almost surely, 2^199656402740 is an apocalyptic number.

199656402740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199656402740 is an abundant number, since it is smaller than the sum of its proper divisors (219622043056).

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

199656402740 is a wasteful number, since it uses less digits than its factorization.

199656402740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9982820146 (or 9982820144 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 199656402740 in words is "one hundred ninety-nine billion, six hundred fifty-six million, four hundred two thousand, seven hundred forty".