195987777711 has 32 divisors (see below), whose sum is σ = 286241464320. Its totient is φ = 118294149600.

The previous prime is 195987777709. The next prime is 195987777751. The reversal of 195987777711 is 117777789591.

It is not a de Polignac number, because 195987777711 - 2¹ = 195987777709 is a prime.

It is a super-2 number, since 2×195987777711² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195987777751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20344866 + ... + 20354496.

It is an arithmetic number, because the mean of its divisors is an integer number (8945045760).

Almost surely, 2^195987777711 is an apocalyptic number.

195987777711 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

195987777711 is a deficient number, since it is larger than the sum of its proper divisors (90253686609).

195987777711 is a wasteful number, since it uses less digits than its factorization.

195987777711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12107.

The product of its digits is 54454680, while the sum is 69.

The spelling of 195987777711 in words is "one hundred ninety-five billion, nine hundred eighty-seven million, seven hundred seventy-seven thousand, seven hundred eleven".