1655244640 has 48 divisors (see below), whose sum is σ = 4469163552. Its totient is φ = 567512064.

The previous prime is 1655244631. The next prime is 1655244667. The reversal of 1655244640 is 464425561.

It is a self number, because there is not a number n which added to its sum of digits gives 1655244640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737829 + ... + 740068.

It is an arithmetic number, because the mean of its divisors is an integer number (93107574).

Almost surely, 2^1655244640 is an apocalyptic number.

1655244640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1655244640 is an abundant number, since it is smaller than the sum of its proper divisors (2813918912).

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

1655244640 is a wasteful number, since it uses less digits than its factorization.

1655244640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477919 (or 1477911 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

The square root of 1655244640 is about 40684.6978604979. The cubic root of 1655244640 is about 1182.9164285949.

The spelling of 1655244640 in words is "one billion, six hundred fifty-five million, two hundred forty-four thousand, six hundred forty".