1918644348632 has 64 divisors (see below), whose sum is σ = 3964546252800. Its totient is φ = 863243619840.

The previous prime is 1918644348619. The next prime is 1918644348659. The reversal of 1918644348632 is 2368434468191.

It is a super-2 number, since 2×1918644348632² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4640969 + ... + 5037447.

It is an arithmetic number, because the mean of its divisors is an integer number (61946035200).

Almost surely, 2^{1918644348632} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1918644348632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1982273126400).

1918644348632 is an abundant number, since it is smaller than the sum of its proper divisors (2045901904168).

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

1918644348632 is a wasteful number, since it uses less digits than its factorization.

1918644348632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397056 (or 397052 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 59.

The spelling of 1918644348632 in words is "one trillion, nine hundred eighteen billion, six hundred forty-four million, three hundred forty-eight thousand, six hundred thirty-two".