155555720707 has 4 divisors (see below), whose sum is σ = 155578941216. Its totient is φ = 155532500200.

The previous prime is 155555720699. The next prime is 155555720713. The reversal of 155555720707 is 707027555551.

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

It is a cyclic number.

It is not a de Polignac number, because 155555720707 - 2³ = 155555720699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155555720737) 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, 11600203 + ... + 11613604.

It is an arithmetic number, because the mean of its divisors is an integer number (38894735304).

Almost surely, 2^155555720707 is an apocalyptic number.

155555720707 is a deficient number, since it is larger than the sum of its proper divisors (23220509).

155555720707 is an equidigital number, since it uses as much as digits as its factorization.

155555720707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23220508.

The product of its (nonzero) digits is 2143750, while the sum is 49.

The spelling of 155555720707 in words is "one hundred fifty-five billion, five hundred fifty-five million, seven hundred twenty thousand, seven hundred seven".