66416510409 has 8 divisors (see below), whose sum is σ = 93216155040. Its totient is φ = 41947269696.

The previous prime is 66416510399. The next prime is 66416510417. The reversal of 66416510409 is 90401561466.

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

It is a de Polignac number, because none of the positive numbers 2^k-66416510409 is a prime.

It is a super-2 number, since 2×66416510409² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66416530409) 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, 582600912 + ... + 582601025.

It is an arithmetic number, because the mean of its divisors is an integer number (11652019380).

Almost surely, 2^66416510409 is an apocalyptic number.

It is an amenable number.

66416510409 is a deficient number, since it is larger than the sum of its proper divisors (26799644631).

66416510409 is a wasteful number, since it uses less digits than its factorization.

66416510409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165201959.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 66416510409 in words is "sixty-six billion, four hundred sixteen million, five hundred ten thousand, four hundred nine".