1655738899 has 2 divisors, whose sum is σ = 1655738900. Its totient is φ = 1655738898.

The previous prime is 1655738897. The next prime is 1655738933. The reversal of 1655738899 is 9988375561.

It is a weak prime.

It is an emirp because it is prime and its reverse (9988375561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1655738899 - 2¹ = 1655738897 is a prime.

Together with 1655738897, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1655738893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827869449 + 827869450.

It is an arithmetic number, because the mean of its divisors is an integer number (827869450).

Almost surely, 2^1655738899 is an apocalyptic number.

1655738899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655738899 is an equidigital number, since it uses as much as digits as its factorization.

1655738899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16329600, while the sum is 61.

The square root of 1655738899 is about 40690.7716687703. The cubic root of 1655738899 is about 1183.0341571958.

The spelling of 1655738899 in words is "one billion, six hundred fifty-five million, seven hundred thirty-eight thousand, eight hundred ninety-nine".