66131015 has 16 divisors (see below), whose sum is σ = 82200096. Its totient is φ = 51043200.

The previous prime is 66130993. The next prime is 66131041. The reversal of 66131015 is 51013166.

It is a happy number.

66131015 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66131015 - 2¹² = 66126919 is a prime.

It is a super-2 number, since 2×66131015² = 8746622289860450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14120 + ... + 18210.

It is an arithmetic number, because the mean of its divisors is an integer number (5137506).

Almost surely, 2^66131015 is an apocalyptic number.

66131015 is a deficient number, since it is larger than the sum of its proper divisors (16069081).

66131015 is a wasteful number, since it uses less digits than its factorization.

66131015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4210.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 66131015 is about 8132.0978228253. The cubic root of 66131015 is about 404.3912309035.

The spelling of 66131015 in words is "sixty-six million, one hundred thirty-one thousand, fifteen".