2557211623 has 2 divisors, whose sum is σ = 2557211624. Its totient is φ = 2557211622.

The previous prime is 2557211617. The next prime is 2557211633. The reversal of 2557211623 is 3261127552.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2557211623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2557211603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278605811 + 1278605812.

It is an arithmetic number, because the mean of its divisors is an integer number (1278605812).

Almost surely, 2^2557211623 is an apocalyptic number.

2557211623 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557211623 is an equidigital number, since it uses as much as digits as its factorization.

2557211623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 34.

The square root of 2557211623 is about 50568.8799856196. The cubic root of 2557211623 is about 1367.4839042386.

The spelling of 2557211623 in words is "two billion, five hundred fifty-seven million, two hundred eleven thousand, six hundred twenty-three".