63694909440 has 416 divisors, whose sum is σ = 228477788160. Its totient is φ = 16832987136.

The previous prime is 63694909417. The next prime is 63694909441. The reversal of 63694909440 is 4490949636.

63694909440 is a `hidden beast` number, since 6 + 3 + 69 + 490 + 94 + 4 + 0 = 666.

It is a super-2 number, since 2×63694909440² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (63694909441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70225467 + ... + 70226373.

Almost surely, 2^63694909440 is an apocalyptic number.

63694909440 is a gapful number since it is divisible by the number (60) 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 63694909440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114238894080).

63694909440 is an abundant number, since it is smaller than the sum of its proper divisors (164782878720).

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

63694909440 is a wasteful number, since it uses less digits than its factorization.

63694909440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072 (or 1044 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 54.

The spelling of 63694909440 in words is "sixty-three billion, six hundred ninety-four million, nine hundred nine thousand, four hundred forty".