63691949399041 has 4 divisors (see below), whose sum is σ = 63691988255572. Its totient is φ = 63691910542512.

The previous prime is 63691949399027. The next prime is 63691949399053. The reversal of 63691949399041 is 14099394919636.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28884132364816 + 34807817034225 = 5374396^2 + 5899815^2 .

It is a cyclic number.

It is not a de Polignac number, because 63691949399041 - 2¹¹ = 63691949396993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63691949399021) 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, 16856010 + ... + 20285683.

It is an arithmetic number, because the mean of its divisors is an integer number (15922997063893).

Almost surely, 2^{63691949399041} is an apocalyptic number.

It is an amenable number.

63691949399041 is a deficient number, since it is larger than the sum of its proper divisors (38856531).

63691949399041 is a wasteful number, since it uses less digits than its factorization.

63691949399041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38856530.

The product of its (nonzero) digits is 306110016, while the sum is 73.

The spelling of 63691949399041 in words is "sixty-three trillion, six hundred ninety-one billion, nine hundred forty-nine million, three hundred ninety-nine thousand, forty-one".