662155638 has 8 divisors (see below), whose sum is σ = 1324311288. Its totient is φ = 220718544.

The previous prime is 662155633. The next prime is 662155649. The reversal of 662155638 is 836551266.

It is a happy number.

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

662155638 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 662155638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (662155633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55179631 + ... + 55179642.

It is an arithmetic number, because the mean of its divisors is an integer number (165538911).

Almost surely, 2^662155638 is an apocalyptic number.

662155638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

662155638 is a wasteful number, since it uses less digits than its factorization.

662155638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110359278.

The product of its digits is 259200, while the sum is 42.

The square root of 662155638 is about 25732.3850041150. The cubic root of 662155638 is about 871.6056304893.

The spelling of 662155638 in words is "six hundred sixty-two million, one hundred fifty-five thousand, six hundred thirty-eight".