655481551 has 16 divisors (see below), whose sum is σ = 707808640. Its totient is φ = 605011680.

The previous prime is 655481543. The next prime is 655481557. The reversal of 655481551 is 155184556.

It is not a de Polignac number, because 655481551 - 2³ = 655481543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655481557) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 441256 + ... + 442738.

It is an arithmetic number, because the mean of its divisors is an integer number (44238040).

Almost surely, 2^655481551 is an apocalyptic number.

655481551 is a deficient number, since it is larger than the sum of its proper divisors (52327089).

655481551 is a wasteful number, since it uses less digits than its factorization.

655481551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086.

The product of its digits is 120000, while the sum is 40.

The square root of 655481551 is about 25602.3739328993. The cubic root of 655481551 is about 868.6673351912.

The spelling of 655481551 in words is "six hundred fifty-five million, four hundred eighty-one thousand, five hundred fifty-one".