2556266601 has 16 divisors (see below), whose sum is σ = 3917030400. Its totient is φ = 1452561168.

The previous prime is 2556266599. The next prime is 2556266651. The reversal of 2556266601 is 1066626552.

It is a happy number.

It is not a de Polignac number, because 2556266601 - 2¹ = 2556266599 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2556266601.

It is not an unprimeable number, because it can be changed into a prime (2556266651) 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, 336261 + ... + 343778.

It is an arithmetic number, because the mean of its divisors is an integer number (244814400).

Almost surely, 2^2556266601 is an apocalyptic number.

2556266601 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2556266601 is a deficient number, since it is larger than the sum of its proper divisors (1360763799).

2556266601 is a wasteful number, since it uses less digits than its factorization.

2556266601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680228.

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

The square root of 2556266601 is about 50559.5352134491. The cubic root of 2556266601 is about 1367.3154314658.

The spelling of 2556266601 in words is "two billion, five hundred fifty-six million, two hundred sixty-six thousand, six hundred one".