1659475901 has 2 divisors, whose sum is σ = 1659475902. Its totient is φ = 1659475900.

The previous prime is 1659475891. The next prime is 1659475969. The reversal of 1659475901 is 1095749561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1447802500 + 211673401 = 38050^2 + 14549^2 .

It is a cyclic number.

It is not a de Polignac number, because 1659475901 - 2²² = 1655281597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1659475801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 829737950 + 829737951.

It is an arithmetic number, because the mean of its divisors is an integer number (829737951).

Almost surely, 2^1659475901 is an apocalyptic number.

It is an amenable number.

1659475901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1659475901 is an equidigital number, since it uses as much as digits as its factorization.

1659475901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 340200, while the sum is 47.

The square root of 1659475901 is about 40736.6653151679. The cubic root of 1659475901 is about 1183.9235242960.

The spelling of 1659475901 in words is "one billion, six hundred fifty-nine million, four hundred seventy-five thousand, nine hundred one".