1655655997 has 2 divisors, whose sum is σ = 1655655998. Its totient is φ = 1655655996.

The previous prime is 1655655977. The next prime is 1655656001. The reversal of 1655655997 is 7995565561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1293553156 + 362102841 = 35966^2 + 19029^2 .

It is an emirp because it is prime and its reverse (7995565561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1655655997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1655655977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827827998 + 827827999.

It is an arithmetic number, because the mean of its divisors is an integer number (827827999).

Almost surely, 2^1655655997 is an apocalyptic number.

It is an amenable number.

1655655997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655655997 is an equidigital number, since it uses as much as digits as its factorization.

1655655997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12757500, while the sum is 58.

The square root of 1655655997 is about 40689.7529729538. The cubic root of 1655655997 is about 1183.0144122278.

The spelling of 1655655997 in words is "one billion, six hundred fifty-five million, six hundred fifty-five thousand, nine hundred ninety-seven".