66142615 has 16 divisors (see below), whose sum is σ = 98956800. Its totient is φ = 41231520.

The previous prime is 66142613. The next prime is 66142619. The reversal of 66142615 is 51624166.

It is not a de Polignac number, because 66142615 - 2¹ = 66142613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66142613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85515 + ... + 86284.

It is an arithmetic number, because the mean of its divisors is an integer number (6184800).

Almost surely, 2^66142615 is an apocalyptic number.

66142615 is a deficient number, since it is larger than the sum of its proper divisors (32814185).

66142615 is a wasteful number, since it uses less digits than its factorization.

66142615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171822.

The product of its digits is 8640, while the sum is 31.

The square root of 66142615 is about 8132.8110146492. The cubic root of 66142615 is about 404.4148741921.

It can be divided in two parts, 6614 and 2615, that added together give a palindrome (9229).

The spelling of 66142615 in words is "sixty-six million, one hundred forty-two thousand, six hundred fifteen".