155640933 has 80 divisors (see below), whose sum is σ = 286729344. Its totient is φ = 82114560.

The previous prime is 155640917. The next prime is 155640937. The reversal of 155640933 is 339046551.

155640933 is a `hidden beast` number, since 1 + 5 + 5 + 640 + 9 + 3 + 3 = 666.

It is not a de Polignac number, because 155640933 - 2⁴ = 155640917 is a prime.

It is a super-2 number, since 2×155640933² = 48448200050220978, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155640937) 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 79 ways as a sum of consecutive naturals, for example, 645693 + ... + 645933.

Almost surely, 2^155640933 is an apocalyptic number.

It is an amenable number.

155640933 is a deficient number, since it is larger than the sum of its proper divisors (131088411).

155640933 is a wasteful number, since it uses less digits than its factorization.

155640933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 155640933 is about 12475.6135320072. The cubic root of 155640933 is about 537.9079238324.

The spelling of 155640933 in words is "one hundred fifty-five million, six hundred forty thousand, nine hundred thirty-three".