155394078717 has 4 divisors (see below), whose sum is σ = 207192104960. Its totient is φ = 103596052476.

The previous prime is 155394078713. The next prime is 155394078757. The reversal of 155394078717 is 717870493551.

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: 717870493551 = 3 ⋅239290164517.

It is not a de Polignac number, because 155394078717 - 2² = 155394078713 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155394078713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25899013117 + ... + 25899013122.

It is an arithmetic number, because the mean of its divisors is an integer number (51798026240).

Almost surely, 2^155394078717 is an apocalyptic number.

It is an amenable number.

155394078717 is a deficient number, since it is larger than the sum of its proper divisors (51798026243).

155394078717 is an equidigital number, since it uses as much as digits as its factorization.

155394078717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51798026242.

The product of its (nonzero) digits is 7408800, while the sum is 57.

The spelling of 155394078717 in words is "one hundred fifty-five billion, three hundred ninety-four million, seventy-eight thousand, seven hundred seventeen".