1655823979 has 2 divisors, whose sum is σ = 1655823980. Its totient is φ = 1655823978.

The previous prime is 1655823973. The next prime is 1655824031. The reversal of 1655823979 is 9793285561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1655823979 - 2³ = 1655823971 is a prime.

It is not a weakly prime, because it can be changed into another prime (1655823971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827911989 + 827911990.

It is an arithmetic number, because the mean of its divisors is an integer number (827911990).

Almost surely, 2^1655823979 is an apocalyptic number.

1655823979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655823979 is an equidigital number, since it uses as much as digits as its factorization.

1655823979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4082400, while the sum is 55.

The square root of 1655823979 is about 40691.8171012306. The cubic root of 1655823979 is about 1183.0544202180.

The spelling of 1655823979 in words is "one billion, six hundred fifty-five million, eight hundred twenty-three thousand, nine hundred seventy-nine".