1691399349547 has 2 divisors, whose sum is σ = 1691399349548. Its totient is φ = 1691399349546.

The previous prime is 1691399349517. The next prime is 1691399349553. The reversal of 1691399349547 is 7459439931961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1691399349547 - 2²³ = 1691390960939 is a prime.

It is not a weakly prime, because it can be changed into another prime (1691399349517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845699674773 + 845699674774.

It is an arithmetic number, because the mean of its divisors is an integer number (845699674774).

Almost surely, 2^{1691399349547} is an apocalyptic number.

1691399349547 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691399349547 is an equidigital number, since it uses as much as digits as its factorization.

1691399349547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 198404640, while the sum is 70.

The spelling of 1691399349547 in words is "one trillion, six hundred ninety-one billion, three hundred ninety-nine million, three hundred forty-nine thousand, five hundred forty-seven".