195923972690 has 64 divisors (see below), whose sum is σ = 384377392224. Its totient is φ = 71621541888.

The previous prime is 195923972677. The next prime is 195923972693. The reversal of 195923972690 is 96279329591.

195923972690 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 442633²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 49090162969 + 146833809721 = 221563^2 + 383189^2 .

It is a super-2 number, since 2×195923972690² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (195923972693) 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, 761882 + ... + 986058.

Almost surely, 2^195923972690 is an apocalyptic number.

195923972690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

195923972690 is a deficient number, since it is larger than the sum of its proper divisors (188453419534).

195923972690 is a wasteful number, since it uses less digits than its factorization.

195923972690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224351.

The product of its (nonzero) digits is 16533720, while the sum is 62.

The spelling of 195923972690 in words is "one hundred ninety-five billion, nine hundred twenty-three million, nine hundred seventy-two thousand, six hundred ninety".