66516501 has 8 divisors (see below), whose sum is σ = 88729344. Its totient is φ = 44324000.

The previous prime is 66516493. The next prime is 66516503. The reversal of 66516501 is 10561566.

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 66516501 - 2³ = 66516493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66516503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6001 + ... + 13001.

It is an arithmetic number, because the mean of its divisors is an integer number (11091168).

Almost surely, 2^66516501 is an apocalyptic number.

It is an amenable number.

66516501 is a deficient number, since it is larger than the sum of its proper divisors (22212843).

66516501 is a wasteful number, since it uses less digits than its factorization.

66516501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10171.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 66516501 is about 8155.7648936197. The cubic root of 66516501 is about 405.1754581926.

The spelling of 66516501 in words is "sixty-six million, five hundred sixteen thousand, five hundred one".