661296552 has 144 divisors (see below), whose sum is σ = 2012300640. Its totient is φ = 180556992.

The previous prime is 661296521. The next prime is 661296593. The reversal of 661296552 is 255692166.

661296552 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 621573 + ... + 622635.

It is an arithmetic number, because the mean of its divisors is an integer number (13974310).

Almost surely, 2^661296552 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 661296552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1006150320).

661296552 is an abundant number, since it is smaller than the sum of its proper divisors (1351004088).

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

661296552 is a wasteful number, since it uses less digits than its factorization.

661296552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132 (or 1098 counting only the distinct ones).

The product of its digits is 194400, while the sum is 42.

The square root of 661296552 is about 25715.6868856346. The cubic root of 661296552 is about 871.2285246592.

The spelling of 661296552 in words is "six hundred sixty-one million, two hundred ninety-six thousand, five hundred fifty-two".