64471019634 has 192 divisors, whose sum is σ = 173028151296. Its totient is φ = 17607227904.

The previous prime is 64471019629. The next prime is 64471019693. The reversal of 64471019634 is 43691017446.

64471019634 is a `hidden beast` number, since 6 + 4 + 4 + 7 + 1 + 0 + 1 + 9 + 634 = 666.

It is a super-2 number, since 2×64471019634² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64471019634.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6870754 + ... + 6880130.

It is an arithmetic number, because the mean of its divisors is an integer number (901188288).

Almost surely, 2^64471019634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64471019634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86514075648).

64471019634 is an abundant number, since it is smaller than the sum of its proper divisors (108557131662).

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

64471019634 is a wasteful number, since it uses less digits than its factorization.

64471019634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9491 (or 9479 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 64471019634 in words is "sixty-four billion, four hundred seventy-one million, nineteen thousand, six hundred thirty-four".