63939080591 has 4 divisors (see below), whose sum is σ = 65145478392. Its totient is φ = 62732682792.

The previous prime is 63939080567. The next prime is 63939080593. The reversal of 63939080591 is 19508093936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63939080591 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 1206397747 = 63939080591 / (6 + 3 + 9 + 3 + 9 + 0 + 8 + 0 + 5 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63939080593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 603198821 + ... + 603198926.

It is an arithmetic number, because the mean of its divisors is an integer number (16286369598).

Almost surely, 2^63939080591 is an apocalyptic number.

63939080591 is a deficient number, since it is larger than the sum of its proper divisors (1206397801).

63939080591 is a wasteful number, since it uses less digits than its factorization.

63939080591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206397800.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The spelling of 63939080591 in words is "sixty-three billion, nine hundred thirty-nine million, eighty thousand, five hundred ninety-one".