655006663640 has 32 divisors (see below), whose sum is σ = 1684302850080. Its totient is φ = 224573713152.

The previous prime is 655006663627. The next prime is 655006663643. The reversal of 655006663640 is 46366600556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655006663643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1169654477 + ... + 1169655036.

It is an arithmetic number, because the mean of its divisors is an integer number (52634464065).

Almost surely, 2^655006663640 is an apocalyptic number.

It is an amenable number.

655006663640 is an abundant number, since it is smaller than the sum of its proper divisors (1029296186440).

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

655006663640 is a wasteful number, since it uses less digits than its factorization.

655006663640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2339309531 (or 2339309527 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 47.

The spelling of 655006663640 in words is "six hundred fifty-five billion, six million, six hundred sixty-three thousand, six hundred forty".