561666054 has 8 divisors (see below), whose sum is σ = 1123332120. Its totient is φ = 187222016.

The previous prime is 561666041. The next prime is 561666067. The reversal of 561666054 is 450666165.

It is an interprime number because it is at equal distance from previous prime (561666041) and next prime (561666067).

It is a sphenic number, since it is the product of 3 distinct primes.

561666054 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46805499 + ... + 46805510.

It is an arithmetic number, because the mean of its divisors is an integer number (140416515).

Almost surely, 2^561666054 is an apocalyptic number.

561666054 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561666054 is a wasteful number, since it uses less digits than its factorization.

561666054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93611014.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 561666054 is about 23699.4948047421. The cubic root of 561666054 is about 825.0736654148.

The spelling of 561666054 in words is "five hundred sixty-one million, six hundred sixty-six thousand, fifty-four".