661352777120 has 96 divisors (see below), whose sum is σ = 1805716281600. Its totient is φ = 224201742336.

The previous prime is 661352777117. The next prime is 661352777123. The reversal of 661352777120 is 21777253166.

It is a happy number.

661352777120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (661352777117) and next prime (661352777123).

It is not an unprimeable number, because it can be changed into a prime (661352777123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3217700 + ... + 3417059.

It is an arithmetic number, because the mean of its divisors is an integer number (18809544600).

Almost surely, 2^661352777120 is an apocalyptic number.

It is an amenable number.

661352777120 is an abundant number, since it is smaller than the sum of its proper divisors (1144363504480).

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

661352777120 is a wasteful number, since it uses less digits than its factorization.

661352777120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6634870 (or 6634862 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 47.

The spelling of 661352777120 in words is "six hundred sixty-one billion, three hundred fifty-two million, seven hundred seventy-seven thousand, one hundred twenty".