637640847887 has 2 divisors, whose sum is σ = 637640847888. Its totient is φ = 637640847886.

The previous prime is 637640847769. The next prime is 637640847911. The reversal of 637640847887 is 788748046736.

637640847887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 637640847887 - 2²² = 637636653583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (637640807887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318820423943 + 318820423944.

It is an arithmetic number, because the mean of its divisors is an integer number (318820423944).

Almost surely, 2^637640847887 is an apocalyptic number.

637640847887 is a deficient number, since it is larger than the sum of its proper divisors (1).

637640847887 is an equidigital number, since it uses as much as digits as its factorization.

637640847887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 303464448, while the sum is 68.

The spelling of 637640847887 in words is "six hundred thirty-seven billion, six hundred forty million, eight hundred forty-seven thousand, eight hundred eighty-seven".