155506656099 has 4 divisors (see below), whose sum is σ = 207342208136. Its totient is φ = 103671104064.

The previous prime is 155506656049. The next prime is 155506656161. The reversal of 155506656099 is 990656605551.

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

It is not a de Polignac number, because 155506656099 - 2¹⁹ = 155506131811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155506656049) 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, 25917776014 + ... + 25917776019.

It is an arithmetic number, because the mean of its divisors is an integer number (51835552034).

Almost surely, 2^155506656099 is an apocalyptic number.

155506656099 is a deficient number, since it is larger than the sum of its proper divisors (51835552037).

155506656099 is an equidigital number, since it uses as much as digits as its factorization.

155506656099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51835552036.

The product of its (nonzero) digits is 10935000, while the sum is 57.

The spelling of 155506656099 in words is "one hundred fifty-five billion, five hundred six million, six hundred fifty-six thousand, ninety-nine".