661305424332 has 144 divisors (see below), whose sum is σ = 1802284979040. Its totient is φ = 188175955968.

The previous prime is 661305424321. The next prime is 661305424357. The reversal of 661305424332 is 233424503166.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 319624594 + ... + 319626662.

It is an arithmetic number, because the mean of its divisors is an integer number (12515867910).

Almost surely, 2^661305424332 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661305424332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (901142489520).

661305424332 is an abundant number, since it is smaller than the sum of its proper divisors (1140979554708).

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

661305424332 is a wasteful number, since it uses less digits than its factorization.

661305424332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040 (or 4031 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 39.

Adding to 661305424332 its reverse (233424503166), we get a palindrome (894729927498).

The spelling of 661305424332 in words is "six hundred sixty-one billion, three hundred five million, four hundred twenty-four thousand, three hundred thirty-two".