1666557476 has 6 divisors (see below), whose sum is σ = 2916475590. Its totient is φ = 833278736.

The previous prime is 1666557457. The next prime is 1666557479. The reversal of 1666557476 is 6747556661.

It can be written as a sum of positive squares in only one way, i.e., 1590414400 + 76143076 = 39880^2 + 8726^2 .

It is a super-2 number, since 2×1666557476² = 5554827641622981152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1666557479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208319681 + ... + 208319688.

It is an arithmetic number, because the mean of its divisors is an integer number (486079265).

Almost surely, 2^1666557476 is an apocalyptic number.

It is an amenable number.

1666557476 is a deficient number, since it is larger than the sum of its proper divisors (1249918114).

1666557476 is a wasteful number, since it uses less digits than its factorization.

1666557476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416639373 (or 416639371 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 53.

The square root of 1666557476 is about 40823.4917173923. The cubic root of 1666557476 is about 1185.6052089612.

The spelling of 1666557476 in words is "one billion, six hundred sixty-six million, five hundred fifty-seven thousand, four hundred seventy-six".