155333220431 has 4 divisors (see below), whose sum is σ = 155379688992. Its totient is φ = 155286751872.

The previous prime is 155333220421. The next prime is 155333220443. The reversal of 155333220431 is 134022333551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134022333551 = 19 ⋅7053807029.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155333220431 is a prime.

It is a super-2 number, since 2×155333220431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155333220421) 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, 23229266 + ... + 23235951.

It is an arithmetic number, because the mean of its divisors is an integer number (38844922248).

Almost surely, 2^155333220431 is an apocalyptic number.

155333220431 is a deficient number, since it is larger than the sum of its proper divisors (46468561).

155333220431 is an equidigital number, since it uses as much as digits as its factorization.

155333220431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46468560.

The product of its (nonzero) digits is 32400, while the sum is 32.

Adding to 155333220431 its reverse (134022333551), we get a palindrome (289355553982).

The spelling of 155333220431 in words is "one hundred fifty-five billion, three hundred thirty-three million, two hundred twenty thousand, four hundred thirty-one".