6491437990990 has 32 divisors (see below), whose sum is σ = 11730655949760. Its totient is φ = 2586340721664.

The previous prime is 6491437990927. The next prime is 6491437990997. The reversal of 6491437990990 is 990997341946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6491437990997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19053822 + ... + 19391518.

It is an arithmetic number, because the mean of its divisors is an integer number (366582998430).

Almost surely, 2^{6491437990990} is an apocalyptic number.

6491437990990 is a deficient number, since it is larger than the sum of its proper divisors (5239217958770).

6491437990990 is a wasteful number, since it uses less digits than its factorization.

6491437990990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345276.

The product of its (nonzero) digits is 119042784, while the sum is 70.

The spelling of 6491437990990 in words is "six trillion, four hundred ninety-one billion, four hundred thirty-seven million, nine hundred ninety thousand, nine hundred ninety".