641655 has 48 divisors (see below), whose sum is σ = 1340640. Its totient is φ = 290304.

The previous prime is 641639. The next prime is 641681. The reversal of 641655 is 556146.

641655 = 42³ + 43³ + ... + 48³.

It is a happy number.

641655 is a `hidden beast` number, since 6 + 4 + 1 + 655 = 666.

It is not a de Polignac number, because 641655 - 2⁴ = 641639 is a prime.

It is a super-2 number, since 2×641655² = 823442278050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

641655 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6567 + ... + 6663.

It is an arithmetic number, because the mean of its divisors is an integer number (27930).

2⁶⁴¹⁶⁵⁵ is an apocalyptic number.

641655 is an abundant number, since it is smaller than the sum of its proper divisors (698985).

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

641655 is a wasteful number, since it uses less digits than its factorization.

641655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 112 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 641655 is about 801.0337071559. The cubic root of 641655 is about 86.2516067754.

It can be divided in two parts, 641 and 655, that added together give a 4-th power (1296 = 6⁴).

The spelling of 641655 in words is "six hundred forty-one thousand, six hundred fifty-five".