1220691896401 has 2 divisors, whose sum is σ = 1220691896402. Its totient is φ = 1220691896400.

The previous prime is 1220691896393. The next prime is 1220691896429. The reversal of 1220691896401 is 1046981960221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1004452946176 + 216238950225 = 1002224^2 + 465015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220691896401 - 2³ = 1220691896393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220691896701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610345948200 + 610345948201.

It is an arithmetic number, because the mean of its divisors is an integer number (610345948201).

Almost surely, 2^{1220691896401} is an apocalyptic number.

It is an amenable number.

1220691896401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220691896401 is an equidigital number, since it uses as much as digits as its factorization.

1220691896401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 49.

The spelling of 1220691896401 in words is "one trillion, two hundred twenty billion, six hundred ninety-one million, eight hundred ninety-six thousand, four hundred one".