1655613643 has 2 divisors, whose sum is σ = 1655613644. Its totient is φ = 1655613642.

The previous prime is 1655613607. The next prime is 1655613671. The reversal of 1655613643 is 3463165561.

It is a strong prime.

It is an emirp because it is prime and its reverse (3463165561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1655613643 - 2⁹ = 1655613131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1655613596 and 1655613605.

It is not a weakly prime, because it can be changed into another prime (1655613943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827806821 + 827806822.

It is an arithmetic number, because the mean of its divisors is an integer number (827806822).

Almost surely, 2^1655613643 is an apocalyptic number.

1655613643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655613643 is an equidigital number, since it uses as much as digits as its factorization.

1655613643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 40.

The square root of 1655613643 is about 40689.2325191813. The cubic root of 1655613643 is about 1183.0043244198.

The spelling of 1655613643 in words is "one billion, six hundred fifty-five million, six hundred thirteen thousand, six hundred forty-three".