1604506643 has 2 divisors, whose sum is σ = 1604506644. Its totient is φ = 1604506642.

The previous prime is 1604506627. The next prime is 1604506679. The reversal of 1604506643 is 3466054061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1604506643 - 2⁴ = 1604506627 is a prime.

It is a super-2 number, since 2×1604506643² = 5148883134862258898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1604506843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802253321 + 802253322.

It is an arithmetic number, because the mean of its divisors is an integer number (802253322).

Almost surely, 2^1604506643 is an apocalyptic number.

1604506643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604506643 is an equidigital number, since it uses as much as digits as its factorization.

1604506643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 1604506643 is about 40056.2934256279. The cubic root of 1604506643 is about 1170.7041912225.

The spelling of 1604506643 in words is "one billion, six hundred four million, five hundred six thousand, six hundred forty-three".