666542316 has 48 divisors (see below), whose sum is σ = 1698173568. Its totient is φ = 201801600.

The previous prime is 666542311. The next prime is 666542321. The reversal of 666542316 is 613245666.

It is an interprime number because it is at equal distance from previous prime (666542311) and next prime (666542321).

It is not an unprimeable number, because it can be changed into a prime (666542311) 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, 263136 + ... + 265656.

It is an arithmetic number, because the mean of its divisors is an integer number (35378616).

Almost surely, 2^666542316 is an apocalyptic number.

666542316 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

666542316 is an abundant number, since it is smaller than the sum of its proper divisors (1031631252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666542316 is a wasteful number, since it uses less digits than its factorization.

666542316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4542 (or 4540 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The square root of 666542316 is about 25817.4808221097. The cubic root of 666542316 is about 873.5261462023.

The spelling of 666542316 in words is "six hundred sixty-six million, five hundred forty-two thousand, three hundred sixteen".