155867171772 has 24 divisors (see below), whose sum is σ = 391666226896. Its totient is φ = 47959129728.

The previous prime is 155867171687. The next prime is 155867171791. The reversal of 155867171772 is 277171768551.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 499574113 + ... + 499574424.

Almost surely, 2^155867171772 is an apocalyptic number.

155867171772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155867171772 is an abundant number, since it is smaller than the sum of its proper divisors (235799055124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155867171772 is a wasteful number, since it uses less digits than its factorization.

155867171772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999148557 (or 999148555 counting only the distinct ones).

The product of its digits is 5762400, while the sum is 57.

The spelling of 155867171772 in words is "one hundred fifty-five billion, eight hundred sixty-seven million, one hundred seventy-one thousand, seven hundred seventy-two".