421687792786657 has 2 divisors, whose sum is σ = 421687792786658. Its totient is φ = 421687792786656.

The previous prime is 421687792786649. The next prime is 421687792786697. The reversal of 421687792786657 is 756687297786124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 312534276892321 + 109153515894336 = 17678639^2 + 10447656^2 .

It is a cyclic number.

It is not a de Polignac number, because 421687792786657 - 2³ = 421687792786649 is a prime.

It is not a weakly prime, because it can be changed into another prime (421687792786697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210843896393328 + 210843896393329.

It is an arithmetic number, because the mean of its divisors is an integer number (210843896393329).

Almost surely, 2^{421687792786657} is an apocalyptic number.

It is an amenable number.

421687792786657 is a deficient number, since it is larger than the sum of its proper divisors (1).

421687792786657 is an equidigital number, since it uses as much as digits as its factorization.

421687792786657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23897825280, while the sum is 85.

The spelling of 421687792786657 in words is "four hundred twenty-one trillion, six hundred eighty-seven billion, seven hundred ninety-two million, seven hundred eighty-six thousand, six hundred fifty-seven".