666711542 has 24 divisors (see below), whose sum is σ = 1231778664. Its totient is φ = 268924992.

The previous prime is 666711541. The next prime is 666711571. The reversal of 666711542 is 245117666.

It is a junction number, because it is equal to n+sod(n) for n = 666711496 and 666711505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666711541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198428 + ... + 201759.

It is an arithmetic number, because the mean of its divisors is an integer number (51324111).

Almost surely, 2^666711542 is an apocalyptic number.

666711542 is a deficient number, since it is larger than the sum of its proper divisors (565067122).

666711542 is a wasteful number, since it uses less digits than its factorization.

666711542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400220 (or 400213 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

The square root of 666711542 is about 25820.7579671860. The cubic root of 666711542 is about 873.6000654038.

The spelling of 666711542 in words is "six hundred sixty-six million, seven hundred eleven thousand, five hundred forty-two".