2557746666 has 32 divisors (see below), whose sum is σ = 5688789120. Its totient is φ = 851846112.

The previous prime is 2557746661. The next prime is 2557746677. The reversal of 2557746666 is 6666477552.

2557746666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2557746661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44571 + ... + 84273.

It is an arithmetic number, because the mean of its divisors is an integer number (177774660).

Almost surely, 2^2557746666 is an apocalyptic number.

2557746666 is an abundant number, since it is smaller than the sum of its proper divisors (3131042454).

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

2557746666 is a wasteful number, since it uses less digits than its factorization.

2557746666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40907 (or 40901 counting only the distinct ones).

The product of its digits is 12700800, while the sum is 54.

The square root of 2557746666 is about 50574.1699487001. The cubic root of 2557746666 is about 1367.5792700479.

The spelling of 2557746666 in words is "two billion, five hundred fifty-seven million, seven hundred forty-six thousand, six hundred sixty-six".