661072332120 has 64 divisors (see below), whose sum is σ = 1983444300000. Its totient is φ = 176265750528.

The previous prime is 661072332113. The next prime is 661072332161. The reversal of 661072332120 is 21233270166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 750606 + ... + 1373154.

Almost surely, 2^661072332120 is an apocalyptic number.

661072332120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

661072332120 is an abundant number, since it is smaller than the sum of its proper divisors (1322371967880).

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

661072332120 is a wasteful number, since it uses less digits than its factorization.

661072332120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631412 (or 631408 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The spelling of 661072332120 in words is "six hundred sixty-one billion, seventy-two million, three hundred thirty-two thousand, one hundred twenty".