155670899 has 4 divisors (see below), whose sum is σ = 157546536. Its totient is φ = 153795264.

The previous prime is 155670881. The next prime is 155670913. The reversal of 155670899 is 998076551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 998076551 = 227 ⋅4396813.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155670899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155670299) 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, 937694 + ... + 937859.

It is an arithmetic number, because the mean of its divisors is an integer number (39386634).

Almost surely, 2^155670899 is an apocalyptic number.

155670899 is a deficient number, since it is larger than the sum of its proper divisors (1875637).

155670899 is an equidigital number, since it uses as much as digits as its factorization.

155670899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875636.

The product of its (nonzero) digits is 680400, while the sum is 50.

The square root of 155670899 is about 12476.8144572242. The cubic root of 155670899 is about 537.9424432744.

The spelling of 155670899 in words is "one hundred fifty-five million, six hundred seventy thousand, eight hundred ninety-nine".