661202022 has 48 divisors (see below), whose sum is σ = 1494263808. Its totient is φ = 194594400.

The previous prime is 661201993. The next prime is 661202023. The reversal of 661202022 is 220202166.

It is a super-2 number, since 2×661202022² = 874376227793776968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 661202022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661202023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9147 + ... + 37497.

It is an arithmetic number, because the mean of its divisors is an integer number (31130496).

Almost surely, 2^661202022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661202022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (747131904).

661202022 is an abundant number, since it is smaller than the sum of its proper divisors (833061786).

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

661202022 is a wasteful number, since it uses less digits than its factorization.

661202022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28405 (or 28392 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 661202022 is about 25713.8488367650. The cubic root of 661202022 is about 871.1870096704.

Adding to 661202022 its reverse (220202166), we get a palindrome (881404188).

The spelling of 661202022 in words is "six hundred sixty-one million, two hundred two thousand, twenty-two".