1641654694297 has 2 divisors, whose sum is σ = 1641654694298. Its totient is φ = 1641654694296.

The previous prime is 1641654694283. The next prime is 1641654694363. The reversal of 1641654694297 is 7924964561461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 857542673296 + 784112021001 = 926036^2 + 885501^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641654694297 - 2¹⁵ = 1641654661529 is a prime.

It is not a weakly prime, because it can be changed into another prime (1641654694697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820827347148 + 820827347149.

It is an arithmetic number, because the mean of its divisors is an integer number (820827347149).

Almost surely, 2^{1641654694297} is an apocalyptic number.

It is an amenable number.

1641654694297 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641654694297 is an equidigital number, since it uses as much as digits as its factorization.

1641654694297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78382080, while the sum is 64.

The spelling of 1641654694297 in words is "one trillion, six hundred forty-one billion, six hundred fifty-four million, six hundred ninety-four thousand, two hundred ninety-seven".