145216323531 has 64 divisors (see below), whose sum is σ = 226195200000. Its totient is φ = 91900448640.

The previous prime is 145216323503. The next prime is 145216323533. The reversal of 145216323531 is 135323612541.

145216323531 is a `hidden beast` number, since 1 + 4 + 521 + 63 + 23 + 53 + 1 = 666.

It is not a de Polignac number, because 145216323531 - 2²⁷ = 145082105803 is a prime.

It is a super-2 number, since 2×145216323531² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145216323533) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 56968645 + ... + 56971193.

It is an arithmetic number, because the mean of its divisors is an integer number (3534300000).

Almost surely, 2^145216323531 is an apocalyptic number.

145216323531 is a deficient number, since it is larger than the sum of its proper divisors (80978876469).

145216323531 is a wasteful number, since it uses less digits than its factorization.

145216323531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3241 (or 3235 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The spelling of 145216323531 in words is "one hundred forty-five billion, two hundred sixteen million, three hundred twenty-three thousand, five hundred thirty-one".