1645356543431 has 2 divisors, whose sum is σ = 1645356543432. Its totient is φ = 1645356543430.

The previous prime is 1645356543427. The next prime is 1645356543533. The reversal of 1645356543431 is 1343456535461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1645356543431 - 2² = 1645356543427 is a prime.

It is a super-2 number, since 2×1645356543431² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1645356543431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645356543401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822678271715 + 822678271716.

It is an arithmetic number, because the mean of its divisors is an integer number (822678271716).

Almost surely, 2^{1645356543431} is an apocalyptic number.

1645356543431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645356543431 is an equidigital number, since it uses as much as digits as its factorization.

1645356543431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776000, while the sum is 50.

The spelling of 1645356543431 in words is "one trillion, six hundred forty-five billion, three hundred fifty-six million, five hundred forty-three thousand, four hundred thirty-one".