420400087424557 has 2 divisors, whose sum is σ = 420400087424558. Its totient is φ = 420400087424556.

The previous prime is 420400087424543. The next prime is 420400087424683. The reversal of 420400087424557 is 755424780004024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 420344551317636 + 55536106921 = 20502306^2 + 235661^2 .

It is a cyclic number.

It is not a de Polignac number, because 420400087424557 - 2³⁹ = 419850331610669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420400087424857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210200043712278 + 210200043712279.

It is an arithmetic number, because the mean of its divisors is an integer number (210200043712279).

Almost surely, 2^{420400087424557} is an apocalyptic number.

It is an amenable number.

420400087424557 is a deficient number, since it is larger than the sum of its proper divisors (1).

420400087424557 is an equidigital number, since it uses as much as digits as its factorization.

420400087424557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10035200, while the sum is 52.

The spelling of 420400087424557 in words is "four hundred twenty trillion, four hundred billion, eighty-seven million, four hundred twenty-four thousand, five hundred fifty-seven".