196464197779 has 4 divisors (see below), whose sum is σ = 196477064784. Its totient is φ = 196451330776.

The previous prime is 196464197731. The next prime is 196464197807. The reversal of 196464197779 is 977791464691.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 196464197779 - 2¹³ = 196464189587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196464197719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6410572 + ... + 6441145.

It is an arithmetic number, because the mean of its divisors is an integer number (49119266196).

Almost surely, 2^196464197779 is an apocalyptic number.

196464197779 is a deficient number, since it is larger than the sum of its proper divisors (12867005).

196464197779 is a wasteful number, since it uses less digits than its factorization.

196464197779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12867004.

The product of its digits is 144027072, while the sum is 70.

The spelling of 196464197779 in words is "one hundred ninety-six billion, four hundred sixty-four million, one hundred ninety-seven thousand, seven hundred seventy-nine".