1977824561653 has 2 divisors, whose sum is σ = 1977824561654. Its totient is φ = 1977824561652.

The previous prime is 1977824561599. The next prime is 1977824561711. The reversal of 1977824561653 is 3561654287791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1934263445284 + 43561116369 = 1390778^2 + 208713^2 .

It is a cyclic number.

It is not a de Polignac number, because 1977824561653 - 2¹³ = 1977824553461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1977824591653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 988912280826 + 988912280827.

It is an arithmetic number, because the mean of its divisors is an integer number (988912280827).

Almost surely, 2^{1977824561653} is an apocalyptic number.

It is an amenable number.

1977824561653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977824561653 is an equidigital number, since it uses as much as digits as its factorization.

1977824561653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76204800, while the sum is 64.

The spelling of 1977824561653 in words is "one trillion, nine hundred seventy-seven billion, eight hundred twenty-four million, five hundred sixty-one thousand, six hundred fifty-three".