665123542 has 8 divisors (see below), whose sum is σ = 997963776. Its totient is φ = 332468952.

The previous prime is 665123531. The next prime is 665123603. The reversal of 665123542 is 245321566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×665123542² = 884778652245251528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665123498 and 665123507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37078 + ... + 52009.

It is an arithmetic number, because the mean of its divisors is an integer number (124745472).

Almost surely, 2^665123542 is an apocalyptic number.

665123542 is a deficient number, since it is larger than the sum of its proper divisors (332840234).

665123542 is a wasteful number, since it uses less digits than its factorization.

665123542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92822.

The product of its digits is 43200, while the sum is 34.

The square root of 665123542 is about 25789.9891818512. The cubic root of 665123542 is about 872.9059222350.

The spelling of 665123542 in words is "six hundred sixty-five million, one hundred twenty-three thousand, five hundred forty-two".