63661577494 has 32 divisors (see below), whose sum is σ = 98976890880. Its totient is φ = 30677961600.

The previous prime is 63661577489. The next prime is 63661577513. The reversal of 63661577494 is 49477516636.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20396254 + ... + 20399374.

It is an arithmetic number, because the mean of its divisors is an integer number (3093027840).

Almost surely, 2^63661577494 is an apocalyptic number.

63661577494 is a deficient number, since it is larger than the sum of its proper divisors (35315313386).

63661577494 is a wasteful number, since it uses less digits than its factorization.

63661577494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4396.

The product of its digits is 22861440, while the sum is 58.

The spelling of 63661577494 in words is "sixty-three billion, six hundred sixty-one million, five hundred seventy-seven thousand, four hundred ninety-four".