661415622 has 48 divisors (see below), whose sum is σ = 1545106752. Its totient is φ = 188202000.

The previous prime is 661415621. The next prime is 661415639. The reversal of 661415622 is 226514166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661415621) 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, 69313 + ... + 78275.

It is an arithmetic number, because the mean of its divisors is an integer number (32189724).

Almost surely, 2^661415622 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661415622, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (772553376).

661415622 is an abundant number, since it is smaller than the sum of its proper divisors (883691130).

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

661415622 is a wasteful number, since it uses less digits than its factorization.

661415622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9233 (or 9226 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 661415622 is about 25718.0019052803. The cubic root of 661415622 is about 871.2808113147.

Adding to 661415622 its reverse (226514166), we get a palindrome (887929788).

The spelling of 661415622 in words is "six hundred sixty-one million, four hundred fifteen thousand, six hundred twenty-two".