1659865797 has 16 divisors (see below), whose sum is σ = 2463912000. Its totient is φ = 1104394032.

The previous prime is 1659865793. The next prime is 1659865841. The reversal of 1659865797 is 7975689561.

1659865797 is a `hidden beast` number, since 1 + 6 + 59 + 8 + 6 + 579 + 7 = 666.

It is not a de Polignac number, because 1659865797 - 2² = 1659865793 is a prime.

It is a super-4 number, since 4×1659865797⁴ (a number of 38 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1659865793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46647 + ... + 74132.

It is an arithmetic number, because the mean of its divisors is an integer number (153994500).

Almost surely, 2^1659865797 is an apocalyptic number.

It is an amenable number.

1659865797 is a deficient number, since it is larger than the sum of its proper divisors (804046203).

1659865797 is a wasteful number, since it uses less digits than its factorization.

1659865797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121297 (or 121291 counting only the distinct ones).

The product of its digits is 28576800, while the sum is 63.

The square root of 1659865797 is about 40741.4506000952. The cubic root of 1659865797 is about 1184.0162384875.

The spelling of 1659865797 in words is "one billion, six hundred fifty-nine million, eight hundred sixty-five thousand, seven hundred ninety-seven".