64994171904 has 264 divisors, whose sum is σ = 196037914800. Its totient is φ = 21507047424.

The previous prime is 64994171899. The next prime is 64994171909. The reversal of 64994171904 is 40917149946.

It is an interprime number because it is at equal distance from previous prime (64994171899) and next prime (64994171909).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64994171909) 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, 37075092 + ... + 37076844.

Almost surely, 2^64994171904 is an apocalyptic number.

64994171904 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 64994171904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98018957400).

64994171904 is an abundant number, since it is smaller than the sum of its proper divisors (131043742896).

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

64994171904 is a wasteful number, since it uses less digits than its factorization.

64994171904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937 (or 1907 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 64994171904 in words is "sixty-four billion, nine hundred ninety-four million, one hundred seventy-one thousand, nine hundred four".