1212651642563 has 8 divisors (see below), whose sum is σ = 1235663851248. Its totient is φ = 1189644322464.

The previous prime is 1212651642539. The next prime is 1212651642581. The reversal of 1212651642563 is 3652461562121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212651642563 - 2⁴⁰ = 113140014787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212611642563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 719381 + ... + 1715462.

It is an arithmetic number, because the mean of its divisors is an integer number (154457981406).

Almost surely, 2^{1212651642563} is an apocalyptic number.

1212651642563 is a deficient number, since it is larger than the sum of its proper divisors (23012208685).

1212651642563 is an equidigital number, since it uses as much as digits as its factorization.

1212651642563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2444293.

The product of its digits is 518400, while the sum is 44.

The spelling of 1212651642563 in words is "one trillion, two hundred twelve billion, six hundred fifty-one million, six hundred forty-two thousand, five hundred sixty-three".