1645933490431 has 2 divisors, whose sum is σ = 1645933490432. Its totient is φ = 1645933490430.

The previous prime is 1645933490393. The next prime is 1645933490473. The reversal of 1645933490431 is 1340943395461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1645933490431 - 2⁹ = 1645933489919 is a prime.

It is a super-2 number, since 2×1645933490431² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645933490491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822966745215 + 822966745216.

It is an arithmetic number, because the mean of its divisors is an integer number (822966745216).

Almost surely, 2^{1645933490431} is an apocalyptic number.

1645933490431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645933490431 is an equidigital number, since it uses as much as digits as its factorization.

1645933490431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4199040, while the sum is 52.

The spelling of 1645933490431 in words is "one trillion, six hundred forty-five billion, nine hundred thirty-three million, four hundred ninety thousand, four hundred thirty-one".