655511280 has 80 divisors (see below), whose sum is σ = 2081679264. Its totient is φ = 170536960.

The previous prime is 655511251. The next prime is 655511309. The reversal of 655511280 is 82115556.

It is an interprime number because it is at equal distance from previous prime (655511251) and next prime (655511309).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23469 + ... + 43148.

Almost surely, 2^655511280 is an apocalyptic number.

655511280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

655511280 is an abundant number, since it is smaller than the sum of its proper divisors (1426167984).

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

655511280 is a wasteful number, since it uses less digits than its factorization.

655511280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66674 (or 66668 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 33.

The square root of 655511280 is about 25602.9545170084. The cubic root of 655511280 is about 868.6804676334.

The spelling of 655511280 in words is "six hundred fifty-five million, five hundred eleven thousand, two hundred eighty".