191878165463 has 2 divisors, whose sum is σ = 191878165464. Its totient is φ = 191878165462.

The previous prime is 191878165433. The next prime is 191878165529. The reversal of 191878165463 is 364561878191.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 191878165463 - 2¹⁴ = 191878149079 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191878165433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95939082731 + 95939082732.

It is an arithmetic number, because the mean of its divisors is an integer number (95939082732).

Almost surely, 2^191878165463 is an apocalyptic number.

191878165463 is a deficient number, since it is larger than the sum of its proper divisors (1).

191878165463 is an equidigital number, since it uses as much as digits as its factorization.

191878165463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 59.

The spelling of 191878165463 in words is "one hundred ninety-one billion, eight hundred seventy-eight million, one hundred sixty-five thousand, four hundred sixty-three".