655601623440 has 40 divisors (see below), whose sum is σ = 2032365033408. Its totient is φ = 174827099520.

The previous prime is 655601623429. The next prime is 655601623463. The reversal of 655601623440 is 44326106556.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 655601623392 and 655601623401.

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 7 ways as a sum of consecutive naturals, for example, 1365836476 + ... + 1365836955.

Almost surely, 2^655601623440 is an apocalyptic number.

655601623440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

655601623440 is an abundant number, since it is smaller than the sum of its proper divisors (1376763409968).

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

655601623440 is a wasteful number, since it uses less digits than its factorization.

655601623440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2731673447 (or 2731673441 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

Adding to 655601623440 its reverse (44326106556), we get a palindrome (699927729996).

The spelling of 655601623440 in words is "six hundred fifty-five billion, six hundred one million, six hundred twenty-three thousand, four hundred forty".