1890916653697 has 2 divisors, whose sum is σ = 1890916653698. Its totient is φ = 1890916653696.

The previous prime is 1890916653667. The next prime is 1890916653709. The reversal of 1890916653697 is 7963566190981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1603766427201 + 287150226496 = 1266399^2 + 535864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1890916653697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1890916653667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945458326848 + 945458326849.

It is an arithmetic number, because the mean of its divisors is an integer number (945458326849).

Almost surely, 2^{1890916653697} is an apocalyptic number.

It is an amenable number.

1890916653697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890916653697 is an equidigital number, since it uses as much as digits as its factorization.

1890916653697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 132269760, while the sum is 70.

The spelling of 1890916653697 in words is "one trillion, eight hundred ninety billion, nine hundred sixteen million, six hundred fifty-three thousand, six hundred ninety-seven".