66360551 has 4 divisors (see below), whose sum is σ = 66744312. Its totient is φ = 65976792.

The previous prime is 66360533. The next prime is 66360601. The reversal of 66360551 is 15506366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15506366 = 2 ⋅7753183.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66360551 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 (66360251) 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, 191621 + ... + 191966.

It is an arithmetic number, because the mean of its divisors is an integer number (16686078).

Almost surely, 2^66360551 is an apocalyptic number.

66360551 is a deficient number, since it is larger than the sum of its proper divisors (383761).

66360551 is a wasteful number, since it uses less digits than its factorization.

66360551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383760.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 66360551 is about 8146.1985612923. The cubic root of 66360551 is about 404.8585615952.

The spelling of 66360551 in words is "sixty-six million, three hundred sixty thousand, five hundred fifty-one".