66549031 has 4 divisors (see below), whose sum is σ = 66598000. Its totient is φ = 66500064.

The previous prime is 66549029. The next prime is 66549053. The reversal of 66549031 is 13094566.

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 66549031 - 2¹ = 66549029 is a prime.

It is a super-2 number, since 2×66549031² = 8857547054077922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66549071) 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, 22386 + ... + 25183.

It is an arithmetic number, because the mean of its divisors is an integer number (16649500).

Almost surely, 2^66549031 is an apocalyptic number.

66549031 is a deficient number, since it is larger than the sum of its proper divisors (48969).

66549031 is a wasteful number, since it uses less digits than its factorization.

66549031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48968.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 66549031 is about 8157.7589447102. The cubic root of 66549031 is about 405.2414979943.

The spelling of 66549031 in words is "sixty-six million, five hundred forty-nine thousand, thirty-one".