155665715601 has 16 divisors (see below), whose sum is σ = 227106931968. Its totient is φ = 94057827600.

The previous prime is 155665715591. The next prime is 155665715627. The reversal of 155665715601 is 106517566551.

It is not a de Polignac number, because 155665715601 - 2³⁰ = 154591973777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155665710601) 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 15 ways as a sum of consecutive naturals, for example, 7114671 + ... + 7136516.

It is an arithmetic number, because the mean of its divisors is an integer number (14194183248).

Almost surely, 2^155665715601 is an apocalyptic number.

155665715601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155665715601 is a deficient number, since it is larger than the sum of its proper divisors (71441216367).

155665715601 is a wasteful number, since it uses less digits than its factorization.

155665715601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14251532.

The product of its (nonzero) digits is 945000, while the sum is 48.

The spelling of 155665715601 in words is "one hundred fifty-five billion, six hundred sixty-five million, seven hundred fifteen thousand, six hundred one".