155556256326433 has 4 divisors (see below), whose sum is σ = 155956143875220. Its totient is φ = 155156368777648.

The previous prime is 155556256326421. The next prime is 155556256326437. The reversal of 155556256326433 is 334623652655551.

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 83426430313249 + 72129826013184 = 9133807^2 + 8492928^2 .

It is a cyclic number.

It is not a de Polignac number, because 155556256326433 - 2³³ = 155547666391841 is a prime.

It is a super-3 number, since 3×155556256326433³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155556256326437) 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, 199943773810 + ... + 199943774587.

It is an arithmetic number, because the mean of its divisors is an integer number (38989035968805).

Almost surely, 2^{155556256326433} is an apocalyptic number.

It is an amenable number.

155556256326433 is a deficient number, since it is larger than the sum of its proper divisors (399887548787).

155556256326433 is an equidigital number, since it uses as much as digits as its factorization.

155556256326433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399887548786.

The product of its digits is 291600000, while the sum is 61.

The spelling of 155556256326433 in words is "one hundred fifty-five trillion, five hundred fifty-six billion, two hundred fifty-six million, three hundred twenty-six thousand, four hundred thirty-three".