155240021533 has 4 divisors (see below), whose sum is σ = 155241518140. Its totient is φ = 155238524928.

The previous prime is 155240021527. The next prime is 155240021557. The reversal of 155240021533 is 335120042551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3593642809 + 151646378724 = 59947^2 + 389418^2 .

It is a cyclic number.

It is not a de Polignac number, because 155240021533 - 2³³ = 146650086941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155240021495 and 155240021504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155240021513) 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 3 ways as a sum of consecutive naturals, for example, 580110 + ... + 804367.

It is an arithmetic number, because the mean of its divisors is an integer number (38810379535).

Almost surely, 2^155240021533 is an apocalyptic number.

It is an amenable number.

155240021533 is a deficient number, since it is larger than the sum of its proper divisors (1496607).

155240021533 is a wasteful number, since it uses less digits than its factorization.

155240021533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1496606.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 155240021533 in words is "one hundred fifty-five billion, two hundred forty million, twenty-one thousand, five hundred thirty-three".