196767643640 has 64 divisors (see below), whose sum is σ = 458648892000. Its totient is φ = 75884300800.

The previous prime is 196767643619. The next prime is 196767643663. The reversal of 196767643640 is 46346767691.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 196767643640.

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, 692171 + ... + 934149.

Almost surely, 2^196767643640 is an apocalyptic number.

196767643640 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 196767643640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229324446000).

196767643640 is an abundant number, since it is smaller than the sum of its proper divisors (261881248360).

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

196767643640 is a wasteful number, since it uses less digits than its factorization.

196767643640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242720 (or 242716 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 59.

The spelling of 196767643640 in words is "one hundred ninety-six billion, seven hundred sixty-seven million, six hundred forty-three thousand, six hundred forty".