145715521538 has 8 divisors (see below), whose sum is σ = 218670735888. Its totient is φ = 72825276244.

The previous prime is 145715521531. The next prime is 145715521541. The reversal of 145715521538 is 835125517541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 145715521492 and 145715521501.

It is not an unprimeable number, because it can be changed into a prime (145715521531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16236656 + ... + 16245627.

It is an arithmetic number, because the mean of its divisors is an integer number (27333841986).

Almost surely, 2^145715521538 is an apocalyptic number.

145715521538 is a deficient number, since it is larger than the sum of its proper divisors (72955214350).

145715521538 is a wasteful number, since it uses less digits than its factorization.

145715521538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32484528.

The product of its digits is 840000, while the sum is 47.

The spelling of 145715521538 in words is "one hundred forty-five billion, seven hundred fifteen million, five hundred twenty-one thousand, five hundred thirty-eight".