155978911 has 8 divisors (see below), whose sum is σ = 170924544. Its totient is φ = 141160920.

The previous prime is 155978909. The next prime is 155978941. The reversal of 155978911 is 119879551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155978911 - 2¹ = 155978909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155978941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29341 + ... + 34246.

It is an arithmetic number, because the mean of its divisors is an integer number (21365568).

Almost surely, 2^155978911 is an apocalyptic number.

155978911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155978911 is a deficient number, since it is larger than the sum of its proper divisors (14945633).

155978911 is a wasteful number, since it uses less digits than its factorization.

155978911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63821.

The product of its digits is 113400, while the sum is 46.

The square root of 155978911 is about 12489.1517326038. The cubic root of 155978911 is about 538.2970023013.

The spelling of 155978911 in words is "one hundred fifty-five million, nine hundred seventy-eight thousand, nine hundred eleven".