155727361566 has 32 divisors (see below), whose sum is σ = 395498062080. Its totient is φ = 44493531768.

The previous prime is 155727361529. The next prime is 155727361579. The reversal of 155727361566 is 665163727551.

155727361566 is a `hidden beast` number, since 1 + 5 + 5 + 7 + 2 + 73 + 6 + 1 + 566 = 666.

It is a super-2 number, since 2×155727361566² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205988196 + ... + 205988951.

It is an arithmetic number, because the mean of its divisors is an integer number (12359314440).

Almost surely, 2^155727361566 is an apocalyptic number.

155727361566 is an abundant number, since it is smaller than the sum of its proper divisors (239770700514).

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

155727361566 is a wasteful number, since it uses less digits than its factorization.

155727361566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411977165 (or 411977159 counting only the distinct ones).

The product of its digits is 7938000, while the sum is 54.

The spelling of 155727361566 in words is "one hundred fifty-five billion, seven hundred twenty-seven million, three hundred sixty-one thousand, five hundred sixty-six".