155727727551 has 32 divisors (see below), whose sum is σ = 252031564800. Its totient is φ = 94249045440.

The previous prime is 155727727543. The next prime is 155727727601.

155727727551 is a `hidden beast` number, since 1 + 5 + 57 + 277 + 275 + 51 = 666.

155727727551 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 155727727551 - 2³ = 155727727543 is a prime.

It is a super-2 number, since 2×155727727551² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155727727501) 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 31 ways as a sum of consecutive naturals, for example, 151086 + ... + 578171.

It is an arithmetic number, because the mean of its divisors is an integer number (7875986400).

Almost surely, 2^155727727551 is an apocalyptic number.

155727727551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155727727551 is a deficient number, since it is larger than the sum of its proper divisors (96303837249).

155727727551 is a wasteful number, since it uses less digits than its factorization.

155727727551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729996 (or 729990 counting only the distinct ones).

The product of its digits is 6002500, while the sum is 54.

The spelling of 155727727551 in words is "one hundred fifty-five billion, seven hundred twenty-seven million, seven hundred twenty-seven thousand, five hundred fifty-one".