1666455461 has 16 divisors (see below), whose sum is σ = 1848389760. Its totient is φ = 1489720320.

The previous prime is 1666455421. The next prime is 1666455487. The reversal of 1666455461 is 1645546661.

It is not a de Polignac number, because 1666455461 - 2¹⁴ = 1666439077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666455421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280520 + ... + 286398.

It is an arithmetic number, because the mean of its divisors is an integer number (115524360).

Almost surely, 2^1666455461 is an apocalyptic number.

1666455461 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1666455461 is a deficient number, since it is larger than the sum of its proper divisors (181934299).

1666455461 is a wasteful number, since it uses less digits than its factorization.

1666455461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6316.

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

The square root of 1666455461 is about 40822.2422338607. The cubic root of 1666455461 is about 1185.5810169796.

The spelling of 1666455461 in words is "one billion, six hundred sixty-six million, four hundred fifty-five thousand, four hundred sixty-one".