661122288 has 30 divisors (see below), whose sum is σ = 1850224584. Its totient is φ = 220374048.

The previous prime is 661122247. The next prime is 661122311. The reversal of 661122288 is 882221166.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2295420 + ... + 2295707.

Almost surely, 2^661122288 is an apocalyptic number.

It is an amenable number.

661122288 is an abundant number, since it is smaller than the sum of its proper divisors (1189102296).

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

661122288 is a wasteful number, since it uses less digits than its factorization.

661122288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4591141 (or 4591132 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 661122288 is about 25712.2983803471. The cubic root of 661122288 is about 871.1519896033.

The spelling of 661122288 in words is "six hundred sixty-one million, one hundred twenty-two thousand, two hundred eighty-eight".