66417387 has 8 divisors (see below), whose sum is σ = 89416704. Its totient is φ = 43848168.

The previous prime is 66417367. The next prime is 66417389. The reversal of 66417387 is 78371466.

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

It is not a de Polignac number, because 66417387 - 2⁷ = 66417259 is a prime.

It is a super-2 number, since 2×66417387² = 8822538591815538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66417389) 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, 107163 + ... + 107780.

It is an arithmetic number, because the mean of its divisors is an integer number (11177088).

Almost surely, 2^66417387 is an apocalyptic number.

66417387 is a deficient number, since it is larger than the sum of its proper divisors (22999317).

66417387 is a wasteful number, since it uses less digits than its factorization.

66417387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215049.

The product of its digits is 169344, while the sum is 42.

The square root of 66417387 is about 8149.6863129816. The cubic root of 66417387 is about 404.9741120474.

It can be divided in two parts, 6641 and 7387, that added together give a triangular number (14028 = T₁₆₇).

The spelling of 66417387 in words is "sixty-six million, four hundred seventeen thousand, three hundred eighty-seven".