66415361 has 4 divisors (see below), whose sum is σ = 68557824. Its totient is φ = 64272900.

The previous prime is 66415357. The next prime is 66415369. The reversal of 66415361 is 16351466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16351466 = 2 ⋅8175733.

It is a cyclic number.

It is not a de Polignac number, because 66415361 - 2² = 66415357 is a prime.

It is a super-2 number, since 2×66415361² = 8822000353520642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66415369) 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, 1071185 + ... + 1071246.

It is an arithmetic number, because the mean of its divisors is an integer number (17139456).

Almost surely, 2^66415361 is an apocalyptic number.

It is an amenable number.

66415361 is a deficient number, since it is larger than the sum of its proper divisors (2142463).

66415361 is a wasteful number, since it uses less digits than its factorization.

66415361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142462.

The product of its digits is 12960, while the sum is 32.

The square root of 66415361 is about 8149.5620127710. The cubic root of 66415361 is about 404.9699942206.

The spelling of 66415361 in words is "sixty-six million, four hundred fifteen thousand, three hundred sixty-one".