155256717723 has 4 divisors (see below), whose sum is σ = 207008956968. Its totient is φ = 103504478480.

The previous prime is 155256717697. The next prime is 155256717731. The reversal of 155256717723 is 327717652551.

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 155256717723 - 2⁸ = 155256717467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155256717773) 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, 25876119618 + ... + 25876119623.

It is an arithmetic number, because the mean of its divisors is an integer number (51752239242).

Almost surely, 2^155256717723 is an apocalyptic number.

155256717723 is a deficient number, since it is larger than the sum of its proper divisors (51752239245).

155256717723 is an equidigital number, since it uses as much as digits as its factorization.

155256717723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51752239244.

The product of its digits is 3087000, while the sum is 51.

The spelling of 155256717723 in words is "one hundred fifty-five billion, two hundred fifty-six million, seven hundred seventeen thousand, seven hundred twenty-three".