66681562 has 8 divisors (see below), whose sum is σ = 102348576. Its totient is φ = 32565372.

The previous prime is 66681547. The next prime is 66681607. The reversal of 66681562 is 26518666.

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

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, 387598 + ... + 387769.

It is an arithmetic number, because the mean of its divisors is an integer number (12793572).

Almost surely, 2^66681562 is an apocalyptic number.

66681562 is a deficient number, since it is larger than the sum of its proper divisors (35667014).

66681562 is a wasteful number, since it uses less digits than its factorization.

66681562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775412.

The product of its digits is 103680, while the sum is 40.

The square root of 66681562 is about 8165.8779074880. The cubic root of 66681562 is about 405.5103295981.

It can be divided in two parts, 666 and 81562, that added together give a palindrome (82228).

The spelling of 66681562 in words is "sixty-six million, six hundred eighty-one thousand, five hundred sixty-two".