155232641521 has 4 divisors (see below), whose sum is σ = 155374927344. Its totient is φ = 155090355700.

The previous prime is 155232641507. The next prime is 155232641527. The reversal of 155232641521 is 125146232551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125146232551 = 21661 ⋅5777491.

It is a cyclic number.

It is not a de Polignac number, because 155232641521 - 2¹³ = 155232633329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155232641527) 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, 71141275 + ... + 71143456.

It is an arithmetic number, because the mean of its divisors is an integer number (38843731836).

Almost surely, 2^155232641521 is an apocalyptic number.

It is an amenable number.

155232641521 is a deficient number, since it is larger than the sum of its proper divisors (142285823).

155232641521 is a wasteful number, since it uses less digits than its factorization.

155232641521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142285822.

The product of its digits is 72000, while the sum is 37.

The spelling of 155232641521 in words is "one hundred fifty-five billion, two hundred thirty-two million, six hundred forty-one thousand, five hundred twenty-one".