155393931617 has 4 divisors (see below), whose sum is σ = 156262054320. Its totient is φ = 154525808916.

The previous prime is 155393931577. The next prime is 155393931643. The reversal of 155393931617 is 716139393551.

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: 716139393551 = 19 ⋅37691547029.

It is a cyclic number.

It is not a de Polignac number, because 155393931617 - 2²⁶ = 155326822753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155393934617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434061083 + ... + 434061440.

It is an arithmetic number, because the mean of its divisors is an integer number (39065513580).

Almost surely, 2^155393931617 is an apocalyptic number.

It is an amenable number.

155393931617 is a deficient number, since it is larger than the sum of its proper divisors (868122703).

155393931617 is an equidigital number, since it uses as much as digits as its factorization.

155393931617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868122702.

The product of its digits is 2296350, while the sum is 53.

The spelling of 155393931617 in words is "one hundred fifty-five billion, three hundred ninety-three million, nine hundred thirty-one thousand, six hundred seventeen".