63945518493 has 4 divisors (see below), whose sum is σ = 85260691328. Its totient is φ = 42630345660.

The previous prime is 63945518477. The next prime is 63945518503. The reversal of 63945518493 is 39481554936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 63945518493 - 2⁴ = 63945518477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63945518423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10657586413 + ... + 10657586418.

It is an arithmetic number, because the mean of its divisors is an integer number (21315172832).

Almost surely, 2^63945518493 is an apocalyptic number.

It is an amenable number.

63945518493 is a deficient number, since it is larger than the sum of its proper divisors (21315172835).

63945518493 is a wasteful number, since it uses less digits than its factorization.

63945518493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21315172834.

The product of its digits is 13996800, while the sum is 57.

The spelling of 63945518493 in words is "sixty-three billion, nine hundred forty-five million, five hundred eighteen thousand, four hundred ninety-three".