1974662048621 has 2 divisors, whose sum is σ = 1974662048622. Its totient is φ = 1974662048620.

The previous prime is 1974662048539. The next prime is 1974662048657. The reversal of 1974662048621 is 1268402664791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1670261572996 + 304400475625 = 1292386^2 + 551725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1974662048621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1974662048521) 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, 987331024310 + 987331024311.

It is an arithmetic number, because the mean of its divisors is an integer number (987331024311).

Almost surely, 2^{1974662048621} is an apocalyptic number.

It is an amenable number.

1974662048621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1974662048621 is an equidigital number, since it uses as much as digits as its factorization.

1974662048621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6967296, while the sum is 56.

The spelling of 1974662048621 in words is "one trillion, nine hundred seventy-four billion, six hundred sixty-two million, forty-eight thousand, six hundred twenty-one".