66355359925 has 12 divisors (see below), whose sum is σ = 82363205476. Its totient is φ = 53031024000.

The previous prime is 66355359901. The next prime is 66355359937. The reversal of 66355359925 is 52995355366.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 41899729 + 66313460196 = 6473^2 + 257514^2 .

It is not a de Polignac number, because 66355359925 - 2⁷ = 66355359797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66355359925.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1306176 + ... + 1356025.

Almost surely, 2^66355359925 is an apocalyptic number.

It is an amenable number.

66355359925 is a deficient number, since it is larger than the sum of its proper divisors (16007845551).

66355359925 is a wasteful number, since it uses less digits than its factorization.

66355359925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663208 (or 2663203 counting only the distinct ones).

The product of its digits is 32805000, while the sum is 58.

The spelling of 66355359925 in words is "sixty-six billion, three hundred fifty-five million, three hundred fifty-nine thousand, nine hundred twenty-five".