66418624 has 14 divisors (see below), whose sum is σ = 131799584. Its totient is φ = 33209280.

The previous prime is 66418621. The next prime is 66418631. The reversal of 66418624 is 42681466.

It is a super-2 number, since 2×66418624² = 8822867228106752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66418621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 518832 + ... + 518959.

It is an arithmetic number, because the mean of its divisors is an integer number (9414256).

Almost surely, 2^66418624 is an apocalyptic number.

66418624 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66418624 is a deficient number, since it is larger than the sum of its proper divisors (65380960).

66418624 is a wasteful number, since it uses less digits than its factorization.

66418624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037803 (or 1037793 counting only the distinct ones).

The product of its digits is 55296, while the sum is 37.

The square root of 66418624 is about 8149.7622051199. The cubic root of 66418624 is about 404.9766261977.

The spelling of 66418624 in words is "sixty-six million, four hundred eighteen thousand, six hundred twenty-four".