1644064135000 has 160 divisors (see below), whose sum is σ = 4661296532640. Its totient is φ = 530521344000.

The previous prime is 1644064134997. The next prime is 1644064135003. The reversal of 1644064135000 is 5314604461.

It is an interprime number because it is at equal distance from previous prime (1644064134997) and next prime (1644064135003).

It is a super-3 number, since 3×1644064135000³ (a number of 38 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644064135003) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 786567 + ... + 1976566.

It is an arithmetic number, because the mean of its divisors is an integer number (29133103329).

Almost surely, 2^{1644064135000} is an apocalyptic number.

1644064135000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1644064135000 is an abundant number, since it is smaller than the sum of its proper divisors (3017232397640).

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

1644064135000 is a wasteful number, since it uses less digits than its factorization.

1644064135000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2763183 (or 2763164 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 1644064135000 its reverse (5314604461), we get a palindrome (1649378739461).

The spelling of 1644064135000 in words is "one trillion, six hundred forty-four billion, sixty-four million, one hundred thirty-five thousand".