1655639057 has 2 divisors, whose sum is σ = 1655639058. Its totient is φ = 1655639056.

The previous prime is 1655639033. The next prime is 1655639059. The reversal of 1655639057 is 7509365561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1652341201 + 3297856 = 40649^2 + 1816^2 .

It is a cyclic number.

It is not a de Polignac number, because 1655639057 - 2²⁰ = 1654590481 is a prime.

It is a super-2 number, since 2×1655639057² = 5482281374127698498, which contains 22 as substring.

Together with 1655639059, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1655639059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827819528 + 827819529.

It is an arithmetic number, because the mean of its divisors is an integer number (827819529).

Almost surely, 2^1655639057 is an apocalyptic number.

It is an amenable number.

1655639057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655639057 is an equidigital number, since it uses as much as digits as its factorization.

1655639057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 850500, while the sum is 47.

The square root of 1655639057 is about 40689.5448119047. The cubic root of 1655639057 is about 1183.0103775063.

The spelling of 1655639057 in words is "one billion, six hundred fifty-five million, six hundred thirty-nine thousand, fifty-seven".