655001605 has 4 divisors (see below), whose sum is σ = 786001932. Its totient is φ = 524001280.

The previous prime is 655001597. The next prime is 655001629. The reversal of 655001605 is 506100556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 408605796 + 246395809 = 20214^2 + 15697^2 .

It is not a de Polignac number, because 655001605 - 2³ = 655001597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65500156 + ... + 65500165.

It is an arithmetic number, because the mean of its divisors is an integer number (196500483).

Almost surely, 2^655001605 is an apocalyptic number.

It is an amenable number.

655001605 is a deficient number, since it is larger than the sum of its proper divisors (131000327).

655001605 is a wasteful number, since it uses less digits than its factorization.

655001605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131000326.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 655001605 is about 25592.9991403899. Note that the first 3 decimals coincide. The cubic root of 655001605 is about 868.4552696195.

The spelling of 655001605 in words is "six hundred fifty-five million, one thousand, six hundred five".