1645407561767 has 2 divisors, whose sum is σ = 1645407561768. Its totient is φ = 1645407561766.

The previous prime is 1645407561697. The next prime is 1645407561779. The reversal of 1645407561767 is 7671657045461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1645407561767 - 2¹⁶ = 1645407496231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645407561467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822703780883 + 822703780884.

It is an arithmetic number, because the mean of its divisors is an integer number (822703780884).

Almost surely, 2^{1645407561767} is an apocalyptic number.

1645407561767 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645407561767 is an equidigital number, since it uses as much as digits as its factorization.

1645407561767 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29635200, while the sum is 59.

The spelling of 1645407561767 in words is "one trillion, six hundred forty-five billion, four hundred seven million, five hundred sixty-one thousand, seven hundred sixty-seven".