63977819041 has 4 divisors (see below), whose sum is σ = 64179642132. Its totient is φ = 63775995952.

The previous prime is 63977819029. The next prime is 63977819047. The reversal of 63977819041 is 14091877936.

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 2970795025 + 61007024016 = 54505^2 + 246996^2 .

It is a cyclic number.

It is not a de Polignac number, because 63977819041 - 2²³ = 63969430433 is a prime.

It is a super-2 number, since 2×63977819041² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63977819047) 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, 100911070 + ... + 100911703.

It is an arithmetic number, because the mean of its divisors is an integer number (16044910533).

Almost surely, 2^63977819041 is an apocalyptic number.

It is an amenable number.

63977819041 is a deficient number, since it is larger than the sum of its proper divisors (201823091).

63977819041 is a wasteful number, since it uses less digits than its factorization.

63977819041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201823090.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 63977819041 in words is "sixty-three billion, nine hundred seventy-seven million, eight hundred nineteen thousand, forty-one".