145773973644 has 96 divisors (see below), whose sum is σ = 372931991040. Its totient is φ = 44043637248.

The previous prime is 145773973637. The next prime is 145773973753. The reversal of 145773973644 is 446379377541.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8615697 + ... + 8632599.

It is an arithmetic number, because the mean of its divisors is an integer number (3884708240).

Almost surely, 2^145773973644 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 145773973644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186465995520).

145773973644 is an abundant number, since it is smaller than the sum of its proper divisors (227158017396).

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

145773973644 is a wasteful number, since it uses less digits than its factorization.

145773973644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17919 (or 17917 counting only the distinct ones).

The product of its digits is 53343360, while the sum is 60.

The spelling of 145773973644 in words is "one hundred forty-five billion, seven hundred seventy-three million, nine hundred seventy-three thousand, six hundred forty-four".