1672700726621 has 2 divisors, whose sum is σ = 1672700726622. Its totient is φ = 1672700726620.

The previous prime is 1672700726549. The next prime is 1672700726623. The reversal of 1672700726621 is 1266270072761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 880333704121 + 792367022500 = 938261^2 + 890150^2 .

It is a cyclic number.

It is not a de Polignac number, because 1672700726621 - 2³⁸ = 1397822819677 is a prime.

Together with 1672700726623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1672700726623) 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 as a sum of consecutive naturals, namely, 836350363310 + 836350363311.

It is an arithmetic number, because the mean of its divisors is an integer number (836350363311).

Almost surely, 2^{1672700726621} is an apocalyptic number.

It is an amenable number.

1672700726621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1672700726621 is an equidigital number, since it uses as much as digits as its factorization.

1672700726621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 592704, while the sum is 47.

The spelling of 1672700726621 in words is "one trillion, six hundred seventy-two billion, seven hundred million, seven hundred twenty-six thousand, six hundred twenty-one".