159557977 has 2 divisors, whose sum is σ = 159557978. Its totient is φ = 159557976.

The previous prime is 159557963. The next prime is 159557999. The reversal of 159557977 is 779755951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90269001 + 69288976 = 9501^2 + 8324^2 .

It is a cyclic number.

It is not a de Polignac number, because 159557977 - 2¹⁵ = 159525209 is a prime.

It is not a weakly prime, because it can be changed into another prime (159558977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79778988 + 79778989.

It is an arithmetic number, because the mean of its divisors is an integer number (79778989).

Almost surely, 2^159557977 is an apocalyptic number.

It is an amenable number.

159557977 is a deficient number, since it is larger than the sum of its proper divisors (1).

159557977 is an equidigital number, since it uses as much as digits as its factorization.

159557977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3472875, while the sum is 55.

The square root of 159557977 is about 12631.6260631797. The cubic root of 159557977 is about 542.3831309762.

It can be divided in two parts, 15955 and 7977, that multiplied together give a triangular number (127273035 = T₁₅₉₅₄).

The spelling of 159557977 in words is "one hundred fifty-nine million, five hundred fifty-seven thousand, nine hundred seventy-seven".