66515851 has 8 divisors (see below), whose sum is σ = 67161600. Its totient is φ = 65873640.

The previous prime is 66515843. The next prime is 66515861. The reversal of 66515851 is 15851566.

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

It is a cyclic number.

It is not a de Polignac number, because 66515851 - 2³ = 66515843 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 66515851.

It is not an unprimeable number, because it can be changed into a prime (66515861) 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, 49770 + ... + 51088.

It is an arithmetic number, because the mean of its divisors is an integer number (8395200).

Almost surely, 2^66515851 is an apocalyptic number.

66515851 is a deficient number, since it is larger than the sum of its proper divisors (645749).

66515851 is a wasteful number, since it uses less digits than its factorization.

66515851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769.

The product of its digits is 36000, while the sum is 37.

The square root of 66515851 is about 8155.7250444090. The cubic root of 66515851 is about 405.1741383952.

The spelling of 66515851 in words is "sixty-six million, five hundred fifteen thousand, eight hundred fifty-one".