1661472414691 has 2 divisors, whose sum is σ = 1661472414692. Its totient is φ = 1661472414690.

The previous prime is 1661472414677. The next prime is 1661472414799. The reversal of 1661472414691 is 1964142741661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1661472414691 - 2¹¹ = 1661472412643 is a prime.

It is not a weakly prime, because it can be changed into another prime (1661472414611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830736207345 + 830736207346.

It is an arithmetic number, because the mean of its divisors is an integer number (830736207346).

Almost surely, 2^{1661472414691} is an apocalyptic number.

1661472414691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661472414691 is an equidigital number, since it uses as much as digits as its factorization.

1661472414691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 52.

The spelling of 1661472414691 in words is "one trillion, six hundred sixty-one billion, four hundred seventy-two million, four hundred fourteen thousand, six hundred ninety-one".