1666002356 has 6 divisors (see below), whose sum is σ = 2915504130. Its totient is φ = 833001176.

The previous prime is 1666002347. The next prime is 1666002361. The reversal of 1666002356 is 6532006661.

It can be written as a sum of positive squares in only one way, i.e., 1483482256 + 182520100 = 38516^2 + 13510^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208250291 + ... + 208250298.

It is an arithmetic number, because the mean of its divisors is an integer number (485917355).

Almost surely, 2^1666002356 is an apocalyptic number.

It is an amenable number.

1666002356 is a deficient number, since it is larger than the sum of its proper divisors (1249501774).

1666002356 is a wasteful number, since it uses less digits than its factorization.

1666002356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416500593 (or 416500591 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 1666002356 is about 40816.6921246688. The cubic root of 1666002356 is about 1185.4735550854.

The spelling of 1666002356 in words is "one billion, six hundred sixty-six million, two thousand, three hundred fifty-six".