1639447557044 has 18 divisors (see below), whose sum is σ = 3153565446402. Its totient is φ = 745203434800.

The previous prime is 1639447557043. The next prime is 1639447557053. The reversal of 1639447557044 is 4407557449361.

It can be written as a sum of positive squares in only one way, i.e., 1048105012900 + 591342544144 = 1023770^2 + 768988^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1639447557043) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1693643687 + ... + 1693644654.

Almost surely, 2^{1639447557044} is an apocalyptic number.

It is an amenable number.

1639447557044 is a deficient number, since it is larger than the sum of its proper divisors (1514117889358).

1639447557044 is a wasteful number, since it uses less digits than its factorization.

1639447557044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3387288367 (or 3387288354 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 59.

The spelling of 1639447557044 in words is "one trillion, six hundred thirty-nine billion, four hundred forty-seven million, five hundred fifty-seven thousand, forty-four".