660806542 has 16 divisors (see below), whose sum is σ = 1106468352. Its totient is φ = 293380920.

The previous prime is 660806533. The next prime is 660806551. The reversal of 660806542 is 245608066.

It is an interprime number because it is at equal distance from previous prime (660806533) and next prime (660806551).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348318 + ... + 350209.

It is an arithmetic number, because the mean of its divisors is an integer number (69154272).

Almost surely, 2^660806542 is an apocalyptic number.

660806542 is a deficient number, since it is larger than the sum of its proper divisors (445661810).

660806542 is a wasteful number, since it uses less digits than its factorization.

660806542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698583.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 660806542 is about 25706.1576669871. The cubic root of 660806542 is about 871.0132827600.

The spelling of 660806542 in words is "six hundred sixty million, eight hundred six thousand, five hundred forty-two".