662121660 has 96 divisors (see below), whose sum is σ = 1923550272. Its totient is φ = 170035200.

The previous prime is 662121643. The next prime is 662121667. The reversal of 662121660 is 66121266.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (662121667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 222744 + ... + 225696.

It is an arithmetic number, because the mean of its divisors is an integer number (20036982).

Almost surely, 2^662121660 is an apocalyptic number.

662121660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 662121660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (961775136).

662121660 is an abundant number, since it is smaller than the sum of its proper divisors (1261428612).

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

662121660 is a wasteful number, since it uses less digits than its factorization.

662121660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103 (or 3101 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 662121660 is about 25731.7247770141. The cubic root of 662121660 is about 871.5907216466.

The spelling of 662121660 in words is "six hundred sixty-two million, one hundred twenty-one thousand, six hundred sixty".