66556204925 has 24 divisors (see below), whose sum is σ = 94332504000. Its totient is φ = 45632321280.

The previous prime is 66556204901. The next prime is 66556204937. The reversal of 66556204925 is 52940265566.

It is not a de Polignac number, because 66556204925 - 2¹⁶ = 66556139389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1527086 + ... + 1570064.

It is an arithmetic number, because the mean of its divisors is an integer number (3930521000).

Almost surely, 2^66556204925 is an apocalyptic number.

It is an amenable number.

66556204925 is a deficient number, since it is larger than the sum of its proper divisors (27776299075).

66556204925 is a wasteful number, since it uses less digits than its factorization.

66556204925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51845 (or 51840 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 50.

The spelling of 66556204925 in words is "sixty-six billion, five hundred fifty-six million, two hundred four thousand, nine hundred twenty-five".