661711552 has 56 divisors (see below), whose sum is σ = 1362167456. Its totient is φ = 318670848.

The previous prime is 661711513. The next prime is 661711559. The reversal of 661711552 is 255117166.

It is not an unprimeable number, because it can be changed into a prime (661711559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242548 + ... + 245260.

Almost surely, 2^661711552 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 661711552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (681083728).

661711552 is an abundant number, since it is smaller than the sum of its proper divisors (700455904).

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

661711552 is a wasteful number, since it uses less digits than its factorization.

661711552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2865 (or 2855 counting only the distinct ones).

The product of its digits is 12600, while the sum is 34.

The square root of 661711552 is about 25723.7546248599. The cubic root of 661711552 is about 871.4107345065.

The spelling of 661711552 in words is "six hundred sixty-one million, seven hundred eleven thousand, five hundred fifty-two".