1670258311621 has 2 divisors, whose sum is σ = 1670258311622. Its totient is φ = 1670258311620.

The previous prime is 1670258311609. The next prime is 1670258311649. The reversal of 1670258311621 is 1261138520761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1598300249121 + 71958062500 = 1264239^2 + 268250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1670258311621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1670258311681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835129155810 + 835129155811.

It is an arithmetic number, because the mean of its divisors is an integer number (835129155811).

Almost surely, 2^{1670258311621} is an apocalyptic number.

It is an amenable number.

1670258311621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670258311621 is an equidigital number, since it uses as much as digits as its factorization.

1670258311621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 1670258311621 in words is "one trillion, six hundred seventy billion, two hundred fifty-eight million, three hundred eleven thousand, six hundred twenty-one".