155844841091 has 4 divisors (see below), whose sum is σ = 157071965952. Its totient is φ = 154617716232.

The previous prime is 155844841079. The next prime is 155844841093. The reversal of 155844841091 is 190148448551.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 155844841091 - 2¹⁸ = 155844578947 is a prime.

It is a super-2 number, since 2×155844841091² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155844841093) 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, 613562240 + ... + 613562493.

It is an arithmetic number, because the mean of its divisors is an integer number (39267991488).

Almost surely, 2^155844841091 is an apocalyptic number.

155844841091 is a deficient number, since it is larger than the sum of its proper divisors (1227124861).

155844841091 is a wasteful number, since it uses less digits than its factorization.

155844841091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227124860.

The product of its (nonzero) digits is 921600, while the sum is 50.

The spelling of 155844841091 in words is "one hundred fifty-five billion, eight hundred forty-four million, eight hundred forty-one thousand, ninety-one".