655740409278 has 8 divisors (see below), whose sum is σ = 1311480818568. Its totient is φ = 218580136424.

The previous prime is 655740409241. The next prime is 655740409327. The reversal of 655740409278 is 872904047556.

It is a happy number.

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

655740409278 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54645034101 + ... + 54645034112.

It is an arithmetic number, because the mean of its divisors is an integer number (163935102321).

Almost surely, 2^655740409278 is an apocalyptic number.

655740409278 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

655740409278 is a wasteful number, since it uses less digits than its factorization.

655740409278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109290068218.

The product of its (nonzero) digits is 16934400, while the sum is 57.

The spelling of 655740409278 in words is "six hundred fifty-five billion, seven hundred forty million, four hundred nine thousand, two hundred seventy-eight".