64968251040 has 384 divisors, whose sum is σ = 283499274240. Its totient is φ = 13499827200.

The previous prime is 64968251009. The next prime is 64968251053. The reversal of 64968251040 is 4015286946.

64968251040 is a `hidden beast` number, since 6 + 4 + 96 + 8 + 2 + 510 + 40 = 666.

It is a super-2 number, since 2×64968251040² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 234985 + ... + 430295.

It is an arithmetic number, because the mean of its divisors is an integer number (738279360).

Almost surely, 2^64968251040 is an apocalyptic number.

64968251040 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 64968251040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141749637120).

64968251040 is an abundant number, since it is smaller than the sum of its proper divisors (218531023200).

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

64968251040 is a wasteful number, since it uses less digits than its factorization.

64968251040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195353 (or 195339 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 64968251040 in words is "sixty-four billion, nine hundred sixty-eight million, two hundred fifty-one thousand, forty".