655020551 has 8 divisors (see below), whose sum is σ = 673886304. Its totient is φ = 636292480.

The previous prime is 655020547. The next prime is 655020563. The reversal of 655020551 is 155020556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 655020551 - 2² = 655020547 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 (655020581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24731 + ... + 43836.

It is an arithmetic number, because the mean of its divisors is an integer number (84235788).

Almost surely, 2^655020551 is an apocalyptic number.

655020551 is a deficient number, since it is larger than the sum of its proper divisors (18865753).

655020551 is a wasteful number, since it uses less digits than its factorization.

655020551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68841.

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 655020551 is about 25593.3692779985. The cubic root of 655020551 is about 868.4636429297.

The spelling of 655020551 in words is "six hundred fifty-five million, twenty thousand, five hundred fifty-one".