661860892 has 24 divisors (see below), whose sum is σ = 1444060800. Its totient is φ = 257867760.

The previous prime is 661860889. The next prime is 661860893. The reversal of 661860892 is 298068166.

661860892 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-5 number, since 5×661860892⁵ (a number of 45 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661860893) 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, 1074142 + ... + 1074757.

It is an arithmetic number, because the mean of its divisors is an integer number (60169200).

Almost surely, 2^661860892 is an apocalyptic number.

It is an amenable number.

661860892 is an abundant number, since it is smaller than the sum of its proper divisors (782199908).

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

661860892 is a wasteful number, since it uses less digits than its factorization.

661860892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148921 (or 2148919 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 661860892 is about 25726.6572255317. The cubic root of 661860892 is about 871.4762850674.

The spelling of 661860892 in words is "six hundred sixty-one million, eight hundred sixty thousand, eight hundred ninety-two".