155578897 has 4 divisors (see below), whose sum is σ = 163767280. Its totient is φ = 147390516.

The previous prime is 155578889. The next prime is 155578901. The reversal of 155578897 is 798875551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 798875551 = 163 ⋅4901077.

It is a cyclic number.

It is not a de Polignac number, because 155578897 - 2³ = 155578889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155578837) 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, 4094163 + ... + 4094200.

It is an arithmetic number, because the mean of its divisors is an integer number (40941820).

Almost surely, 2^155578897 is an apocalyptic number.

It is an amenable number.

155578897 is a deficient number, since it is larger than the sum of its proper divisors (8188383).

155578897 is an equidigital number, since it uses as much as digits as its factorization.

155578897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8188382.

The product of its digits is 3528000, while the sum is 55.

The square root of 155578897 is about 12473.1269936612. The cubic root of 155578897 is about 537.8364471546.

The spelling of 155578897 in words is "one hundred fifty-five million, five hundred seventy-eight thousand, eight hundred ninety-seven".