66415505 has 8 divisors (see below), whose sum is σ = 85829352. Its totient is φ = 49045248.

The previous prime is 66415501. The next prime is 66415511. The reversal of 66415505 is 50551466.

It can be written as a sum of positive squares in 4 ways, for example, as 2798929 + 63616576 = 1673^2 + 7976^2 .

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 66415505 - 2² = 66415501 is a prime.

It is a super-2 number, since 2×66415505² = 8822038608810050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66415501) 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, 510824 + ... + 510953.

It is an arithmetic number, because the mean of its divisors is an integer number (10728669).

Almost surely, 2^66415505 is an apocalyptic number.

66415505 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66415505 is a deficient number, since it is larger than the sum of its proper divisors (19413847).

66415505 is a wasteful number, since it uses less digits than its factorization.

66415505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021795.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 66415505 is about 8149.5708475968. The cubic root of 66415505 is about 404.9702869021.

The spelling of 66415505 in words is "sixty-six million, four hundred fifteen thousand, five hundred five".