1666516445 has 32 divisors (see below), whose sum is σ = 2312948736. Its totient is φ = 1141171200.

The previous prime is 1666516441. The next prime is 1666516457. The reversal of 1666516445 is 5446156661.

It is not a de Polignac number, because 1666516445 - 2² = 1666516441 is a prime.

It is a super-2 number, since 2×1666516445² = 5554554122910876050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1666516396 and 1666516405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666516441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49877 + ... + 76293.

It is an arithmetic number, because the mean of its divisors is an integer number (72279648).

Almost surely, 2^1666516445 is an apocalyptic number.

It is an amenable number.

1666516445 is a deficient number, since it is larger than the sum of its proper divisors (646432291).

1666516445 is a wasteful number, since it uses less digits than its factorization.

1666516445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26501.

The product of its digits is 518400, while the sum is 44.

The square root of 1666516445 is about 40822.9891727688. The cubic root of 1666516445 is about 1185.5954789304.

The spelling of 1666516445 in words is "one billion, six hundred sixty-six million, five hundred sixteen thousand, four hundred forty-five".