66417616 has 20 divisors (see below), whose sum is σ = 135457600. Its totient is φ = 31460832.

The previous prime is 66417613. The next prime is 66417619. The reversal of 66417616 is 61671466.

It is an interprime number because it is at equal distance from previous prime (66417613) and next prime (66417619).

It is a super-2 number, since 2×66417616² = 8822599430246912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66417613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108936 + ... + 109543.

It is an arithmetic number, because the mean of its divisors is an integer number (6772880).

Almost surely, 2^66417616 is an apocalyptic number.

It is an amenable number.

66417616 is an abundant number, since it is smaller than the sum of its proper divisors (69039984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66417616 is a wasteful number, since it uses less digits than its factorization.

66417616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218506 (or 218500 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 66417616 is about 8149.7003625900. The cubic root of 66417616 is about 404.9745774826.

The spelling of 66417616 in words is "sixty-six million, four hundred seventeen thousand, six hundred sixteen".