1212664862780 has 48 divisors (see below), whose sum is σ = 3004279412736. Its totient is φ = 402358847040.

The previous prime is 1212664862767. The next prime is 1212664862813. The reversal of 1212664862780 is 872684662121.

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 15 ways as a sum of consecutive naturals, for example, 139703594 + ... + 139712273.

It is an arithmetic number, because the mean of its divisors is an integer number (62589154432).

Almost surely, 2^{1212664862780} is an apocalyptic number.

1212664862780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212664862780 is an abundant number, since it is smaller than the sum of its proper divisors (1791614549956).

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

1212664862780 is a wasteful number, since it uses less digits than its factorization.

1212664862780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279415914 (or 279415912 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 53.

The spelling of 1212664862780 in words is "one trillion, two hundred twelve billion, six hundred sixty-four million, eight hundred sixty-two thousand, seven hundred eighty".