6431989890655 has 16 divisors (see below), whose sum is σ = 8831355914304. Its totient is φ = 4405336750080.

The previous prime is 6431989890617. The next prime is 6431989890673. The reversal of 6431989890655 is 5560989891346.

It is a de Polignac number, because none of the positive numbers 2^k-6431989890655 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107690626 + ... + 107750335.

It is an arithmetic number, because the mean of its divisors is an integer number (551959744644).

Almost surely, 2^{6431989890655} is an apocalyptic number.

6431989890655 is a deficient number, since it is larger than the sum of its proper divisors (2399366023649).

6431989890655 is a wasteful number, since it uses less digits than its factorization.

6431989890655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215441826.

The product of its (nonzero) digits is 503884800, while the sum is 73.

The spelling of 6431989890655 in words is "six trillion, four hundred thirty-one billion, nine hundred eighty-nine million, eight hundred ninety thousand, six hundred fifty-five".