63949795971264 has 336 divisors, whose sum is σ = 221849218813248. Its totient is φ = 17193470459904.

The previous prime is 63949795971211. The next prime is 63949795971283. The reversal of 63949795971264 is 46217959794936.

It is a happy number.

63949795971264 is a `hidden beast` number, since 6 + 3 + 9 + 4 + 9 + 7 + 9 + 597 + 12 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

It is a super-2 number, since 2×63949795971264² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 391784452 + ... + 391947644.

Almost surely, 2^{63949795971264} is an apocalyptic number.

63949795971264 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63949795971264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110924609406624).

63949795971264 is an abundant number, since it is smaller than the sum of its proper divisors (157899422841984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63949795971264 is a wasteful number, since it uses less digits than its factorization.

63949795971264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168952 (or 168939 counting only the distinct ones).

The product of its digits is 5555329920, while the sum is 81.

The spelling of 63949795971264 in words is "sixty-three trillion, nine hundred forty-nine billion, seven hundred ninety-five million, nine hundred seventy-one thousand, two hundred sixty-four".