2638881945139 has 8 divisors (see below), whose sum is σ = 2888036835840. Its totient is φ = 2391269809800.

The previous prime is 2638881945137. The next prime is 2638881945143. The reversal of 2638881945139 is 9315491888362.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2638881945139 - 2¹ = 2638881945137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2638881945137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385685259 + ... + 385692100.

It is an arithmetic number, because the mean of its divisors is an integer number (361004604480).

Almost surely, 2^{2638881945139} is an apocalyptic number.

2638881945139 is a deficient number, since it is larger than the sum of its proper divisors (249154890701).

2638881945139 is a wasteful number, since it uses less digits than its factorization.

2638881945139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771377681.

The product of its digits is 89579520, while the sum is 67.

The spelling of 2638881945139 in words is "two trillion, six hundred thirty-eight billion, eight hundred eighty-one million, nine hundred forty-five thousand, one hundred thirty-nine".