155621168023 has 2 divisors, whose sum is σ = 155621168024. Its totient is φ = 155621168022.

The previous prime is 155621167993. The next prime is 155621168041. The reversal of 155621168023 is 320861126551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155621168023 - 2¹⁷ = 155621036951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155621168093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77810584011 + 77810584012.

It is an arithmetic number, because the mean of its divisors is an integer number (77810584012).

Almost surely, 2^155621168023 is an apocalyptic number.

155621168023 is a deficient number, since it is larger than the sum of its proper divisors (1).

155621168023 is an equidigital number, since it uses as much as digits as its factorization.

155621168023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 155621168023 in words is "one hundred fifty-five billion, six hundred twenty-one million, one hundred sixty-eight thousand, twenty-three".