660454547 has 4 divisors (see below), whose sum is σ = 660961176. Its totient is φ = 659947920.

The previous prime is 660454541. The next prime is 660454583. The reversal of 660454547 is 745454066.

It is a happy number.

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 660454547 - 2¹⁶ = 660389011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660454541) 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, 251354 + ... + 253967.

It is an arithmetic number, because the mean of its divisors is an integer number (165240294).

Almost surely, 2^660454547 is an apocalyptic number.

660454547 is a deficient number, since it is larger than the sum of its proper divisors (506629).

660454547 is a wasteful number, since it uses less digits than its factorization.

660454547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506628.

The product of its (nonzero) digits is 403200, while the sum is 41.

The square root of 660454547 is about 25699.3102436622. The cubic root of 660454547 is about 870.8585996795.

The spelling of 660454547 in words is "six hundred sixty million, four hundred fifty-four thousand, five hundred forty-seven".