666725542765622 has 16 divisors (see below), whose sum is σ = 1000825093239840. Its totient is φ = 333117199364928.

The previous prime is 666725542765621. The next prime is 666725542765637. The reversal of 666725542765622 is 226567245527666.

It is a super-4 number, since 4×666725542765622⁴ (a number of 60 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666725542765621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58360004 + ... + 68842872.

It is an arithmetic number, because the mean of its divisors is an integer number (62551568327490).

Almost surely, 2^{666725542765622} is an apocalyptic number.

666725542765622 is a deficient number, since it is larger than the sum of its proper divisors (334099550474218).

666725542765622 is a wasteful number, since it uses less digits than its factorization.

666725542765622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10506295.

The product of its digits is 3048192000, while the sum is 71.

The spelling of 666725542765622 in words is "six hundred sixty-six trillion, seven hundred twenty-five billion, five hundred forty-two million, seven hundred sixty-five thousand, six hundred twenty-two".