155809487266 has 4 divisors (see below), whose sum is σ = 233714230902. Its totient is φ = 77904743632.

The previous prime is 155809487203. The next prime is 155809487287. The reversal of 155809487266 is 662784908551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 155765198241 + 44289025 = 394671^2 + 6655^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38952371815 + ... + 38952371818.

Almost surely, 2^155809487266 is an apocalyptic number.

155809487266 is a deficient number, since it is larger than the sum of its proper divisors (77904743636).

155809487266 is an equidigital number, since it uses as much as digits as its factorization.

155809487266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77904743635.

The product of its (nonzero) digits is 29030400, while the sum is 61.

The spelling of 155809487266 in words is "one hundred fifty-five billion, eight hundred nine million, four hundred eighty-seven thousand, two hundred sixty-six".