155451811369 has 4 divisors (see below), whose sum is σ = 156904632144. Its totient is φ = 153998990596.

The previous prime is 155451811367. The next prime is 155451811373. The reversal of 155451811369 is 963118154551.

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: 963118154551 = 7 ⋅137588307793.

It is a cyclic number.

It is not a de Polignac number, because 155451811369 - 2¹ = 155451811367 is a prime.

It is a super-2 number, since 2×155451811369² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155451811367) 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, 726410227 + ... + 726410440.

It is an arithmetic number, because the mean of its divisors is an integer number (39226158036).

Almost surely, 2^155451811369 is an apocalyptic number.

It is an amenable number.

155451811369 is a deficient number, since it is larger than the sum of its proper divisors (1452820775).

155451811369 is a wasteful number, since it uses less digits than its factorization.

155451811369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452820774.

The product of its digits is 648000, while the sum is 49.

The spelling of 155451811369 in words is "one hundred fifty-five billion, four hundred fifty-one million, eight hundred eleven thousand, three hundred sixty-nine".