63978297669 has 24 divisors (see below), whose sum is σ = 108569234592. Its totient is φ = 35792053920.

The previous prime is 63978297563. The next prime is 63978297671. The reversal of 63978297669 is 96679287936.

It is not a de Polignac number, because 63978297669 - 2¹⁷ = 63978166597 is a prime.

It is a super-2 number, since 2×63978297669² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 63978297597 and 63978297606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63978297679) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24854307 + ... + 24856880.

It is an arithmetic number, because the mean of its divisors is an integer number (4523718108).

Almost surely, 2^63978297669 is an apocalyptic number.

It is an amenable number.

63978297669 is a deficient number, since it is larger than the sum of its proper divisors (44590936923).

63978297669 is a wasteful number, since it uses less digits than its factorization.

63978297669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49711217 (or 49711214 counting only the distinct ones).

The product of its digits is 370355328, while the sum is 72.

The spelling of 63978297669 in words is "sixty-three billion, nine hundred seventy-eight million, two hundred ninety-seven thousand, six hundred sixty-nine".