66020515 has 8 divisors (see below), whose sum is σ = 86426928. Its totient is φ = 48014880.

The previous prime is 66020509. The next prime is 66020519. The reversal of 66020515 is 51502066.

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

It is not a de Polignac number, because 66020515 - 2⁷ = 66020387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66020515.

It is not an unprimeable number, because it can be changed into a prime (66020519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 600132 + ... + 600241.

It is an arithmetic number, because the mean of its divisors is an integer number (10803366).

Almost surely, 2^66020515 is an apocalyptic number.

66020515 is a deficient number, since it is larger than the sum of its proper divisors (20406413).

66020515 is a wasteful number, since it uses less digits than its factorization.

66020515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200389.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 66020515 is about 8125.3009175045. The cubic root of 66020515 is about 404.1658694615.

The spelling of 66020515 in words is "sixty-six million, twenty thousand, five hundred fifteen".