1654321816291 has 2 divisors, whose sum is σ = 1654321816292. Its totient is φ = 1654321816290.

The previous prime is 1654321816253. The next prime is 1654321816307. The reversal of 1654321816291 is 1926181234561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1654321816291 - 2³¹ = 1652174332643 is a prime.

It is not a weakly prime, because it can be changed into another prime (1654321816591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827160908145 + 827160908146.

It is an arithmetic number, because the mean of its divisors is an integer number (827160908146).

Almost surely, 2^{1654321816291} is an apocalyptic number.

1654321816291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1654321816291 is an equidigital number, since it uses as much as digits as its factorization.

1654321816291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 49.

The spelling of 1654321816291 in words is "one trillion, six hundred fifty-four billion, three hundred twenty-one million, eight hundred sixteen thousand, two hundred ninety-one".