155000866531 has 4 divisors (see below), whose sum is σ = 177143847472. Its totient is φ = 132857885592.

The previous prime is 155000866409. The next prime is 155000866547. The reversal of 155000866531 is 135668000551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155000866531 - 2¹⁵ = 155000833763 is a prime.

It is a super-2 number, since 2×155000866531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155000566531) 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, 11071490460 + ... + 11071490473.

It is an arithmetic number, because the mean of its divisors is an integer number (44285961868).

Almost surely, 2^155000866531 is an apocalyptic number.

155000866531 is a deficient number, since it is larger than the sum of its proper divisors (22142980941).

155000866531 is an equidigital number, since it uses as much as digits as its factorization.

155000866531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22142980940.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 155000866531 in words is "one hundred fifty-five billion, eight hundred sixty-six thousand, five hundred thirty-one".