1973127665 has 16 divisors (see below), whose sum is σ = 2509148880. Its totient is φ = 1486894080.

The previous prime is 1973127641. The next prime is 1973127671. The reversal of 1973127665 is 5667213791.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2122849 + 1971004816 = 1457^2 + 44396^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1973127665 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160004 + ... + 171893.

It is an arithmetic number, because the mean of its divisors is an integer number (156821805).

Almost surely, 2^1973127665 is an apocalyptic number.

It is an amenable number.

1973127665 is a deficient number, since it is larger than the sum of its proper divisors (536021215).

1973127665 is a wasteful number, since it uses less digits than its factorization.

1973127665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331972.

The product of its digits is 476280, while the sum is 47.

The square root of 1973127665 is about 44419.9016770636. The cubic root of 1973127665 is about 1254.2527500849.

The spelling of 1973127665 in words is "one billion, nine hundred seventy-three million, one hundred twenty-seven thousand, six hundred sixty-five".