155455811 has 4 divisors (see below), whose sum is σ = 177663792. Its totient is φ = 133247832.

The previous prime is 155455801. The next prime is 155455813. The reversal of 155455811 is 118554551.

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 155455811 - 2¹⁸ = 155193667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155455813) 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, 11103980 + ... + 11103993.

It is an arithmetic number, because the mean of its divisors is an integer number (44415948).

Almost surely, 2^155455811 is an apocalyptic number.

155455811 is a deficient number, since it is larger than the sum of its proper divisors (22207981).

155455811 is an equidigital number, since it uses as much as digits as its factorization.

155455811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22207980.

The product of its digits is 20000, while the sum is 35.

The square root of 155455811 is about 12468.1919699690. The cubic root of 155455811 is about 537.6945735802.

The spelling of 155455811 in words is "one hundred fifty-five million, four hundred fifty-five thousand, eight hundred eleven".