1216878619001 has 4 divisors (see below), whose sum is σ = 1237503680400. Its totient is φ = 1196253557604.

The previous prime is 1216878618973. The next prime is 1216878619007. The reversal of 1216878619001 is 1009168786121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1216878619001 - 2³⁸ = 942000712057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216878619007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10312530611 + ... + 10312530728.

It is an arithmetic number, because the mean of its divisors is an integer number (309375920100).

Almost surely, 2^{1216878619001} is an apocalyptic number.

It is an amenable number.

1216878619001 is a deficient number, since it is larger than the sum of its proper divisors (20625061399).

1216878619001 is an equidigital number, since it uses as much as digits as its factorization.

1216878619001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20625061398.

The product of its (nonzero) digits is 290304, while the sum is 50.

The spelling of 1216878619001 in words is "one trillion, two hundred sixteen billion, eight hundred seventy-eight million, six hundred nineteen thousand, one".