661511032 has 32 divisors (see below), whose sum is σ = 1526565600. Its totient is φ = 261696384.

The previous prime is 661511029. The next prime is 661511051. The reversal of 661511032 is 230115166.

It is a super-3 number, since 3×661511032³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 661510988 and 661511006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453607 + ... + 455062.

It is an arithmetic number, because the mean of its divisors is an integer number (47705175).

Almost surely, 2^661511032 is an apocalyptic number.

It is an amenable number.

661511032 is an abundant number, since it is smaller than the sum of its proper divisors (865054568).

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

661511032 is a wasteful number, since it uses less digits than its factorization.

661511032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908695 (or 908691 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 661511032 is about 25719.8567647645. The cubic root of 661511032 is about 871.3227037358.

Adding to 661511032 its reverse (230115166), we get a palindrome (891626198).

The spelling of 661511032 in words is "six hundred sixty-one million, five hundred eleven thousand, thirty-two".