66090481 has 4 divisors (see below), whose sum is σ = 68222464. Its totient is φ = 63958500.

The previous prime is 66090467. The next prime is 66090499. The reversal of 66090481 is 18409066.

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.

It is a cyclic number.

It is not a de Polignac number, because 66090481 - 2¹⁷ = 65959409 is a prime.

It is a super-2 number, since 2×66090481² = 8735903357622722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66090281) 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, 1065945 + ... + 1066006.

It is an arithmetic number, because the mean of its divisors is an integer number (17055616).

Almost surely, 2^66090481 is an apocalyptic number.

It is an amenable number.

66090481 is a deficient number, since it is larger than the sum of its proper divisors (2131983).

66090481 is a wasteful number, since it uses less digits than its factorization.

66090481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131982.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 66090481 is about 8129.6052179672. The cubic root of 66090481 is about 404.3085921987.

The spelling of 66090481 in words is "sixty-six million, ninety thousand, four hundred eighty-one".