66354487 has 4 divisors (see below), whose sum is σ = 66411576. Its totient is φ = 66297400.

The previous prime is 66354481. The next prime is 66354493. The reversal of 66354487 is 78445366.

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

It is an interprime number because it is at equal distance from previous prime (66354481) and next prime (66354493).

It is a cyclic number.

It is not a de Polignac number, because 66354487 - 2¹⁹ = 65830199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66354481) 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, 26764 + ... + 29137.

It is an arithmetic number, because the mean of its divisors is an integer number (16602894).

Almost surely, 2^66354487 is an apocalyptic number.

66354487 is a deficient number, since it is larger than the sum of its proper divisors (57089).

66354487 is a wasteful number, since it uses less digits than its factorization.

66354487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57088.

The product of its digits is 483840, while the sum is 43.

The square root of 66354487 is about 8145.8263546432. The cubic root of 66354487 is about 404.8462292830.

The spelling of 66354487 in words is "sixty-six million, three hundred fifty-four thousand, four hundred eighty-seven".