190778947903 has 4 divisors (see below), whose sum is σ = 193077489528. Its totient is φ = 188480406280.

The previous prime is 190778947841. The next prime is 190778947951. The reversal of 190778947903 is 309749877091.

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 190778947903 - 2²¹ = 190776850751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190778947973) 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, 1149270688 + ... + 1149270853.

It is an arithmetic number, because the mean of its divisors is an integer number (48269372382).

Almost surely, 2^190778947903 is an apocalyptic number.

190778947903 is a deficient number, since it is larger than the sum of its proper divisors (2298541625).

190778947903 is an equidigital number, since it uses as much as digits as its factorization.

190778947903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2298541624.

The product of its (nonzero) digits is 24004512, while the sum is 64.

The spelling of 190778947903 in words is "one hundred ninety billion, seven hundred seventy-eight million, nine hundred forty-seven thousand, nine hundred three".