1660616973 has 12 divisors (see below), whose sum is σ = 2457173628. Its totient is φ = 1080075840.

The previous prime is 1660616927. The next prime is 1660616981. The reversal of 1660616973 is 3796160661.

It can be written as a sum of positive squares in 2 ways, for example, as 521756964 + 1138860009 = 22842^2 + 33747^2 .

It is not a de Polignac number, because 1660616973 - 2⁸ = 1660616717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660616273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2249790 + ... + 2250527.

It is an arithmetic number, because the mean of its divisors is an integer number (204764469).

Almost surely, 2^1660616973 is an apocalyptic number.

It is an amenable number.

1660616973 is a deficient number, since it is larger than the sum of its proper divisors (796556655).

1660616973 is a wasteful number, since it uses less digits than its factorization.

1660616973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500364 (or 4500361 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 1660616973 is about 40750.6683748868. The cubic root of 1660616973 is about 1184.1948212882.

The spelling of 1660616973 in words is "one billion, six hundred sixty million, six hundred sixteen thousand, nine hundred seventy-three".