145641532440 has 128 divisors (see below), whose sum is σ = 440795013120. Its totient is φ = 38494310400.

The previous prime is 145641532411. The next prime is 145641532441. The reversal of 145641532440 is 44235146541.

It is a super-2 number, since 2×145641532440² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145641532441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17841960 + ... + 17850120.

It is an arithmetic number, because the mean of its divisors is an integer number (3443711040).

Almost surely, 2^145641532440 is an apocalyptic number.

145641532440 is a gapful number since it is divisible by the number (10) 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 145641532440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220397506560).

145641532440 is an abundant number, since it is smaller than the sum of its proper divisors (295153480680).

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

145641532440 is a wasteful number, since it uses less digits than its factorization.

145641532440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9473 (or 9469 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 39.

Adding to 145641532440 its reverse (44235146541), we get a palindrome (189876678981).

The spelling of 145641532440 in words is "one hundred forty-five billion, six hundred forty-one million, five hundred thirty-two thousand, four hundred forty".