655155525778 has 8 divisors (see below), whose sum is σ = 1058328157068. Its totient is φ = 302379473424.

The previous prime is 655155525749. The next prime is 655155525793. The reversal of 655155525778 is 877525551556.

It can be written as a sum of positive squares in 2 ways, for example, as 514888048249 + 140267477529 = 717557^2 + 374523^2 .

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

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 in 3 ways as a sum of consecutive naturals, for example, 12599144701 + ... + 12599144752.

Almost surely, 2^655155525778 is an apocalyptic number.

655155525778 is a deficient number, since it is larger than the sum of its proper divisors (403172631290).

655155525778 is a wasteful number, since it uses less digits than its factorization.

655155525778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25198289468.

The product of its digits is 73500000, while the sum is 61.

The spelling of 655155525778 in words is "six hundred fifty-five billion, one hundred fifty-five million, five hundred twenty-five thousand, seven hundred seventy-eight".