1645520280487 has 2 divisors, whose sum is σ = 1645520280488. Its totient is φ = 1645520280486.

The previous prime is 1645520280413. The next prime is 1645520280499. The reversal of 1645520280487 is 7840820255461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1645520280487 - 2⁷ = 1645520280359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645520280407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822760140243 + 822760140244.

It is an arithmetic number, because the mean of its divisors is an integer number (822760140244).

Almost surely, 2^{1645520280487} is an apocalyptic number.

1645520280487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645520280487 is an equidigital number, since it uses as much as digits as its factorization.

1645520280487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4300800, while the sum is 52.

The spelling of 1645520280487 in words is "one trillion, six hundred forty-five billion, five hundred twenty million, two hundred eighty thousand, four hundred eighty-seven".