2251606430644 has 6 divisors (see below), whose sum is σ = 3940311253634. Its totient is φ = 1125803215320.

The previous prime is 2251606430639. The next prime is 2251606430669. The reversal of 2251606430644 is 4460346061522.

It can be written as a sum of positive squares in only one way, i.e., 1964589083044 + 287017347600 = 1401638^2 + 535740^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2251606430644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 281450803827 + ... + 281450803834.

Almost surely, 2^{2251606430644} is an apocalyptic number.

It is an amenable number.

2251606430644 is a deficient number, since it is larger than the sum of its proper divisors (1688704822990).

2251606430644 is a wasteful number, since it uses less digits than its factorization.

2251606430644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562901607665 (or 562901607663 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 43.

The spelling of 2251606430644 in words is "two trillion, two hundred fifty-one billion, six hundred six million, four hundred thirty thousand, six hundred forty-four".