666542045 has 32 divisors (see below), whose sum is σ = 883757952. Its totient is φ = 479561472.

The previous prime is 666542033. The next prime is 666542077. The reversal of 666542045 is 540245666.

It is not a de Polignac number, because 666542045 - 2¹⁰ = 666541021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 560942 + ... + 562128.

It is an arithmetic number, because the mean of its divisors is an integer number (27617436).

Almost surely, 2^666542045 is an apocalyptic number.

666542045 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

666542045 is a deficient number, since it is larger than the sum of its proper divisors (217215907).

666542045 is a wasteful number, since it uses less digits than its factorization.

666542045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421.

The product of its (nonzero) digits is 172800, while the sum is 38.

The square root of 666542045 is about 25817.4755737272. The cubic root of 666542045 is about 873.5260278174.

The spelling of 666542045 in words is "six hundred sixty-six million, five hundred forty-two thousand, forty-five".