66142686 has 64 divisors (see below), whose sum is σ = 144967680. Its totient is φ = 20049120.

The previous prime is 66142621. The next prime is 66142697. The reversal of 66142686 is 68624166.

It is a super-2 number, since 2×66142686² = 8749709822589192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 504841 + ... + 504971.

It is an arithmetic number, because the mean of its divisors is an integer number (2265120).

Almost surely, 2^66142686 is an apocalyptic number.

66142686 is an abundant number, since it is smaller than the sum of its proper divisors (78824994).

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

66142686 is a wasteful number, since it uses less digits than its factorization.

66142686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301.

The product of its digits is 82944, while the sum is 39.

The square root of 66142686 is about 8132.8153796825. The cubic root of 66142686 is about 404.4150188969.

The spelling of 66142686 in words is "sixty-six million, one hundred forty-two thousand, six hundred eighty-six".