2557221744 has 240 divisors, whose sum is σ = 8570562560. Its totient is φ = 642470400.

The previous prime is 2557221721. The next prime is 2557221791. The reversal of 2557221744 is 4471227552.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1259322 + ... + 1261350.

Almost surely, 2^2557221744 is an apocalyptic number.

2557221744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2557221744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4285281280).

2557221744 is an abundant number, since it is smaller than the sum of its proper divisors (6013340816).

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

2557221744 is a wasteful number, since it uses less digits than its factorization.

2557221744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100 (or 2083 counting only the distinct ones).

The product of its digits is 156800, while the sum is 39.

The square root of 2557221744 is about 50568.9800569480. The cubic root of 2557221744 is about 1367.4857083242.

The spelling of 2557221744 in words is "two billion, five hundred fifty-seven million, two hundred twenty-one thousand, seven hundred forty-four".