155287971945 has 96 divisors (see below), whose sum is σ = 300296505600. Its totient is φ = 73772716032.

The previous prime is 155287971863. The next prime is 155287971947. The reversal of 155287971945 is 549179782551.

155287971945 is a `hidden beast` number, since 1 + 5 + 528 + 7 + 97 + 19 + 4 + 5 = 666.

It is not a de Polignac number, because 155287971945 - 2¹¹ = 155287969897 is a prime.

It is a super-2 number, since 2×155287971945² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155287971947) 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 95 ways as a sum of consecutive naturals, for example, 16405284 + ... + 16414746.

It is an arithmetic number, because the mean of its divisors is an integer number (3128088600).

Almost surely, 2^155287971945 is an apocalyptic number.

155287971945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155287971945 is a deficient number, since it is larger than the sum of its proper divisors (145008533655).

155287971945 is a wasteful number, since it uses less digits than its factorization.

155287971945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10639 (or 10636 counting only the distinct ones).

The product of its digits is 31752000, while the sum is 63.

The spelling of 155287971945 in words is "one hundred fifty-five billion, two hundred eighty-seven million, nine hundred seventy-one thousand, nine hundred forty-five".