198451108801571 has 2 divisors, whose sum is σ = 198451108801572. Its totient is φ = 198451108801570.

The previous prime is 198451108801471. The next prime is 198451108801633. The reversal of 198451108801571 is 175108801154891.

It is a strong prime.

It is an emirp because it is prime and its reverse (175108801154891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198451108801571 - 2²⁶ = 198451041692707 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198451108801571.

It is not a weakly prime, because it can be changed into another prime (198451108801471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99225554400785 + 99225554400786.

It is an arithmetic number, because the mean of its divisors is an integer number (99225554400786).

Almost surely, 2^{198451108801571} is an apocalyptic number.

198451108801571 is a deficient number, since it is larger than the sum of its proper divisors (1).

198451108801571 is an equidigital number, since it uses as much as digits as its factorization.

198451108801571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3225600, while the sum is 59.

The spelling of 198451108801571 in words is "one hundred ninety-eight trillion, four hundred fifty-one billion, one hundred eight million, eight hundred one thousand, five hundred seventy-one".