426198801557 has 2 divisors, whose sum is σ = 426198801558. Its totient is φ = 426198801556.

The previous prime is 426198801517. The next prime is 426198801659. The reversal of 426198801557 is 755108891624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395199565201 + 30999236356 = 628649^2 + 176066^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-426198801557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426198801517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213099400778 + 213099400779.

It is an arithmetic number, because the mean of its divisors is an integer number (213099400779).

Almost surely, 2^426198801557 is an apocalyptic number.

It is an amenable number.

426198801557 is a deficient number, since it is larger than the sum of its proper divisors (1).

426198801557 is an equidigital number, since it uses as much as digits as its factorization.

426198801557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4838400, while the sum is 56.

The spelling of 426198801557 in words is "four hundred twenty-six billion, one hundred ninety-eight million, eight hundred one thousand, five hundred fifty-seven".