66042487 has 4 divisors (see below), whose sum is σ = 75477136. Its totient is φ = 56607840.

The previous prime is 66042479. The next prime is 66042491. The reversal of 66042487 is 78424066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66042487 - 2³ = 66042479 is a prime.

It is a super-2 number, since 2×66042487² = 8723220178290338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66042287) 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, 4717314 + ... + 4717327.

It is an arithmetic number, because the mean of its divisors is an integer number (18869284).

Almost surely, 2^66042487 is an apocalyptic number.

66042487 is a deficient number, since it is larger than the sum of its proper divisors (9434649).

66042487 is an equidigital number, since it uses as much as digits as its factorization.

66042487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9434648.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 66042487 is about 8126.6528780304. The cubic root of 66042487 is about 404.2107007159.

The spelling of 66042487 in words is "sixty-six million, forty-two thousand, four hundred eighty-seven".