155686068394 has 4 divisors (see below), whose sum is σ = 233529102594. Its totient is φ = 77843034196.

The previous prime is 155686068353. The next prime is 155686068403. The reversal of 155686068394 is 493860686551.

155686068394 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 493860686551 = 37 ⋅13347586123.

It can be written as a sum of positive squares in only one way, i.e., 142704884169 + 12981184225 = 377763^2 + 113935^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38921517097 + ... + 38921517100.

Almost surely, 2^155686068394 is an apocalyptic number.

155686068394 is a deficient number, since it is larger than the sum of its proper divisors (77843034200).

155686068394 is an equidigital number, since it uses as much as digits as its factorization.

155686068394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77843034199.

The product of its (nonzero) digits is 37324800, while the sum is 61.

The spelling of 155686068394 in words is "one hundred fifty-five billion, six hundred eighty-six million, sixty-eight thousand, three hundred ninety-four".