655478551 has 8 divisors (see below), whose sum is σ = 806742944. Its totient is φ = 518620320.

The previous prime is 655478531. The next prime is 655478557. The reversal of 655478551 is 155874556.

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 655478551 - 2⁵ = 655478519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655478557) 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, 3601440 + ... + 3601621.

It is an arithmetic number, because the mean of its divisors is an integer number (100842868).

Almost surely, 2^655478551 is an apocalyptic number.

655478551 is a deficient number, since it is larger than the sum of its proper divisors (151264393).

655478551 is a wasteful number, since it uses less digits than its factorization.

655478551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7203081.

The product of its digits is 840000, while the sum is 46.

The square root of 655478551 is about 25602.3153445152. The cubic root of 655478551 is about 868.6660099538. Note that the first 3 decimals are identical.

The spelling of 655478551 in words is "six hundred fifty-five million, four hundred seventy-eight thousand, five hundred fifty-one".