1664276356 has 6 divisors (see below), whose sum is σ = 2912483630. Its totient is φ = 832138176.

The previous prime is 1664276279. The next prime is 1664276363. The reversal of 1664276356 is 6536724661.

It can be written as a sum of positive squares in only one way, i.e., 1659258756 + 5017600 = 40734^2 + 2240^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208034541 + ... + 208034548.

Almost surely, 2^1664276356 is an apocalyptic number.

It is an amenable number.

1664276356 is a deficient number, since it is larger than the sum of its proper divisors (1248207274).

1664276356 is a wasteful number, since it uses less digits than its factorization.

1664276356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416069093 (or 416069091 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 46.

The square root of 1664276356 is about 40795.5433350262. The cubic root of 1664276356 is about 1185.0640249787.

The spelling of 1664276356 in words is "one billion, six hundred sixty-four million, two hundred seventy-six thousand, three hundred fifty-six".