135690123578 has 8 divisors (see below), whose sum is σ = 205987416768. Its totient is φ = 67027651324.

The previous prime is 135690123551. The next prime is 135690123599. The reversal of 135690123578 is 875321096531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×135690123578² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408705026 + ... + 408705357.

It is an arithmetic number, because the mean of its divisors is an integer number (25748427096).

Almost surely, 2^135690123578 is an apocalyptic number.

135690123578 is a deficient number, since it is larger than the sum of its proper divisors (70297293190).

135690123578 is an equidigital number, since it uses as much as digits as its factorization.

135690123578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817410468.

The product of its (nonzero) digits is 1360800, while the sum is 50.

The spelling of 135690123578 in words is "one hundred thirty-five billion, six hundred ninety million, one hundred twenty-three thousand, five hundred seventy-eight".