145231556533 has 6 divisors (see below), whose sum is σ = 168942831126. Its totient is φ = 124484191272.

The previous prime is 145231556473. The next prime is 145231556557. The reversal of 145231556533 is 335655132541.

It can be written as a sum of positive squares in only one way, i.e., 117068675409 + 28162881124 = 342153^2 + 167818^2 .

It is not a de Polignac number, because 145231556533 - 2²¹ = 145229459381 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145231556533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145231556233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1481954610 + ... + 1481954707.

It is an arithmetic number, because the mean of its divisors is an integer number (28157138521).

Almost surely, 2^145231556533 is an apocalyptic number.

It is an amenable number.

145231556533 is a deficient number, since it is larger than the sum of its proper divisors (23711274593).

145231556533 is an equidigital number, since it uses as much as digits as its factorization.

145231556533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2963909331 (or 2963909324 counting only the distinct ones).

The product of its digits is 810000, while the sum is 43.

The spelling of 145231556533 in words is "one hundred forty-five billion, two hundred thirty-one million, five hundred fifty-six thousand, five hundred thirty-three".