1645471906223 has 2 divisors, whose sum is σ = 1645471906224. Its totient is φ = 1645471906222.

The previous prime is 1645471906219. The next prime is 1645471906291. The reversal of 1645471906223 is 3226091745461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1645471906223 - 2² = 1645471906219 is a prime.

It is a super-2 number, since 2×1645471906223² (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 (1645471906213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822735953111 + 822735953112.

It is an arithmetic number, because the mean of its divisors is an integer number (822735953112).

Almost surely, 2^{1645471906223} is an apocalyptic number.

1645471906223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645471906223 is an equidigital number, since it uses as much as digits as its factorization.

1645471906223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 1645471906223 in words is "one trillion, six hundred forty-five billion, four hundred seventy-one million, nine hundred six thousand, two hundred twenty-three".