245801891677 has 2 divisors, whose sum is σ = 245801891678. Its totient is φ = 245801891676.

The previous prime is 245801891591. The next prime is 245801891707. The reversal of 245801891677 is 776198108542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218954741476 + 26847150201 = 467926^2 + 163851^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245801891677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245801891177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122900945838 + 122900945839.

It is an arithmetic number, because the mean of its divisors is an integer number (122900945839).

Almost surely, 2^245801891677 is an apocalyptic number.

It is an amenable number.

245801891677 is a deficient number, since it is larger than the sum of its proper divisors (1).

245801891677 is an equidigital number, since it uses as much as digits as its factorization.

245801891677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6773760, while the sum is 58.

The spelling of 245801891677 in words is "two hundred forty-five billion, eight hundred one million, eight hundred ninety-one thousand, six hundred seventy-seven".