195391944457 has 8 divisors (see below), whose sum is σ = 195870899840. Its totient is φ = 194913235440.

The previous prime is 195391944443. The next prime is 195391944499. The reversal of 195391944457 is 754449193591.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 195391944457 - 2³¹ = 193244460809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 195391944395 and 195391944404.

It is not an unprimeable number, because it can be changed into a prime (195391944427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1579894 + ... + 1699072.

It is an arithmetic number, because the mean of its divisors is an integer number (24483862480).

Almost surely, 2^195391944457 is an apocalyptic number.

It is an amenable number.

195391944457 is a deficient number, since it is larger than the sum of its proper divisors (478955383).

195391944457 is a wasteful number, since it uses less digits than its factorization.

195391944457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123183.

The product of its digits is 24494400, while the sum is 61.

The spelling of 195391944457 in words is "one hundred ninety-five billion, three hundred ninety-one million, nine hundred forty-four thousand, four hundred fifty-seven".