135565621378 has 32 divisors (see below), whose sum is σ = 223395531840. Its totient is φ = 61188341760.

The previous prime is 135565621369. The next prime is 135565621417. The reversal of 135565621378 is 873126565531.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2293378 + ... + 2351746.

It is an arithmetic number, because the mean of its divisors is an integer number (6981110370).

Almost surely, 2^135565621378 is an apocalyptic number.

135565621378 is a deficient number, since it is larger than the sum of its proper divisors (87829910462).

135565621378 is a wasteful number, since it uses less digits than its factorization.

135565621378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59122.

The product of its digits is 4536000, while the sum is 52.

The spelling of 135565621378 in words is "one hundred thirty-five billion, five hundred sixty-five million, six hundred twenty-one thousand, three hundred seventy-eight".