1642877170409 has 2 divisors, whose sum is σ = 1642877170410. Its totient is φ = 1642877170408.

The previous prime is 1642877170399. The next prime is 1642877170507. The reversal of 1642877170409 is 9040717782461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1130972694784 + 511904475625 = 1063472^2 + 715475^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642877170409 - 2⁸ = 1642877170153 is a prime.

It is not a weakly prime, because it can be changed into another prime (1642874170409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821438585204 + 821438585205.

It is an arithmetic number, because the mean of its divisors is an integer number (821438585205).

Almost surely, 2^{1642877170409} is an apocalyptic number.

It is an amenable number.

1642877170409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642877170409 is an equidigital number, since it uses as much as digits as its factorization.

1642877170409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4741632, while the sum is 56.

The spelling of 1642877170409 in words is "one trillion, six hundred forty-two billion, eight hundred seventy-seven million, one hundred seventy thousand, four hundred nine".