196662535640 has 64 divisors (see below), whose sum is σ = 451807256160. Its totient is φ = 77015111680.

The previous prime is 196662535613. The next prime is 196662535691. The reversal of 196662535640 is 46535266691.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

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, 890720 + ... + 1089360.

Almost surely, 2^196662535640 is an apocalyptic number.

196662535640 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 196662535640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225903628080).

196662535640 is an abundant number, since it is smaller than the sum of its proper divisors (255144720520).

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

196662535640 is a wasteful number, since it uses less digits than its factorization.

196662535640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199172 (or 199168 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 53.

The spelling of 196662535640 in words is "one hundred ninety-six billion, six hundred sixty-two million, five hundred thirty-five thousand, six hundred forty".