199077179645 has 4 divisors (see below), whose sum is σ = 238892615580. Its totient is φ = 159261743712.

The previous prime is 199077179617. The next prime is 199077179699. The reversal of 199077179645 is 546971770991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546971770991 = 1249 ⋅437927759.

It can be written as a sum of positive squares in 2 ways, for example, as 56443306084 + 142633873561 = 237578^2 + 377669^2 .

It is a cyclic number.

It is not a de Polignac number, because 199077179645 - 2²² = 199072985341 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19907717960 + ... + 19907717969.

It is an arithmetic number, because the mean of its divisors is an integer number (59723153895).

Almost surely, 2^199077179645 is an apocalyptic number.

It is an amenable number.

199077179645 is a deficient number, since it is larger than the sum of its proper divisors (39815435935).

199077179645 is an equidigital number, since it uses as much as digits as its factorization.

199077179645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39815435934.

The product of its (nonzero) digits is 30005640, while the sum is 65.

The spelling of 199077179645 in words is "one hundred ninety-nine billion, seventy-seven million, one hundred seventy-nine thousand, six hundred forty-five".