155636642 has 24 divisors (see below), whose sum is σ = 272005596. Its totient is φ = 66594528.

The previous prime is 155636639. The next prime is 155636659. The reversal of 155636642 is 246636551.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 99221521 + 56415121 = 9961^2 + 7511^2 .

It is a junction number, because it is equal to n+sod(n) for n = 155636596 and 155636605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106388 + ... + 107840.

Almost surely, 2^155636642 is an apocalyptic number.

155636642 is a deficient number, since it is larger than the sum of its proper divisors (116368954).

155636642 is a wasteful number, since it uses less digits than its factorization.

155636642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562 (or 2555 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 155636642 is about 12475.4415553118. The cubic root of 155636642 is about 537.9029804368.

Subtracting 155636642 from its reverse (246636551), we obtain a palindrome (90999909).

The spelling of 155636642 in words is "one hundred fifty-five million, six hundred thirty-six thousand, six hundred forty-two".