661370112 has 216 divisors, whose sum is σ = 2089196928. Its totient is φ = 199987200.

The previous prime is 661370081. The next prime is 661370123. The reversal of 661370112 is 211073166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2126437 + ... + 2126747.

It is an arithmetic number, because the mean of its divisors is an integer number (9672208).

Almost surely, 2^661370112 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 661370112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1044598464).

661370112 is an abundant number, since it is smaller than the sum of its proper divisors (1427826816).

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

661370112 is a wasteful number, since it uses less digits than its factorization.

661370112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 661370112 is about 25717.1171012616. The cubic root of 661370112 is about 871.2608274609.

The spelling of 661370112 in words is "six hundred sixty-one million, three hundred seventy thousand, one hundred twelve".