1220660257660 has 12 divisors (see below), whose sum is σ = 2563386541128. Its totient is φ = 488264103056.

The previous prime is 1220660257643. The next prime is 1220660257697. The reversal of 1220660257660 is 667520660221.

It is a super-3 number, since 3×1220660257660³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 3 ways as a sum of consecutive naturals, for example, 30516506422 + ... + 30516506461.

It is an arithmetic number, because the mean of its divisors is an integer number (213615545094).

Almost surely, 2^{1220660257660} is an apocalyptic number.

1220660257660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220660257660 is an abundant number, since it is smaller than the sum of its proper divisors (1342726283468).

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

1220660257660 is a wasteful number, since it uses less digits than its factorization.

1220660257660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61033012892 (or 61033012890 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 1220660257660 in words is "one trillion, two hundred twenty billion, six hundred sixty million, two hundred fifty-seven thousand, six hundred sixty".