361908666538 has 4 divisors (see below), whose sum is σ = 542862999810. Its totient is φ = 180954333268.

The previous prime is 361908666523. The next prime is 361908666541. The reversal of 361908666538 is 835666809163.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 835666809163 = 43 ⋅19434111841.

It can be written as a sum of positive squares in only one way, i.e., 282893143129 + 79015523409 = 531877^2 + 281097^2 .

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 as a sum of consecutive naturals, namely, 90477166633 + ... + 90477166636.

Almost surely, 2^361908666538 is an apocalyptic number.

361908666538 is a deficient number, since it is larger than the sum of its proper divisors (180954333272).

361908666538 is a wasteful number, since it uses less digits than its factorization.

361908666538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180954333271.

The product of its (nonzero) digits is 33592320, while the sum is 61.

The spelling of 361908666538 in words is "three hundred sixty-one billion, nine hundred eight million, six hundred sixty-six thousand, five hundred thirty-eight".