155643849 has 10 divisors (see below), whose sum is σ = 232505130. Its totient is φ = 103762512.

The previous prime is 155643847. The next prime is 155643853. The reversal of 155643849 is 948346551.

155643849 is a `hidden beast` number, since 1 + 5 + 564 + 3 + 84 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 126967824 + 28676025 = 11268^2 + 5355^2 .

It is not a de Polignac number, because 155643849 - 2¹ = 155643847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155643847) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 960684 + ... + 960845.

It is an arithmetic number, because the mean of its divisors is an integer number (23250513).

Almost surely, 2^155643849 is an apocalyptic number.

It is an amenable number.

155643849 is a deficient number, since it is larger than the sum of its proper divisors (76861281).

155643849 is an equidigital number, since it uses as much as digits as its factorization.

155643849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921541 (or 1921532 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 155643849 is about 12475.7303994596. The cubic root of 155643849 is about 537.9112831238.

The spelling of 155643849 in words is "one hundred fifty-five million, six hundred forty-three thousand, eight hundred forty-nine".