2161377699553 has 2 divisors, whose sum is σ = 2161377699554. Its totient is φ = 2161377699552.

The previous prime is 2161377699521. The next prime is 2161377699571. The reversal of 2161377699553 is 3559967731612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1899344279889 + 262033419664 = 1378167^2 + 511892^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161377699553 - 2⁵ = 2161377699521 is a prime.

It is not a weakly prime, because it can be changed into another prime (2161377699053) 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, 1080688849776 + 1080688849777.

It is an arithmetic number, because the mean of its divisors is an integer number (1080688849777).

Almost surely, 2^{2161377699553} is an apocalyptic number.

It is an amenable number.

2161377699553 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161377699553 is an equidigital number, since it uses as much as digits as its factorization.

2161377699553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64297800, while the sum is 64.

The spelling of 2161377699553 in words is "two trillion, one hundred sixty-one billion, three hundred seventy-seven million, six hundred ninety-nine thousand, five hundred fifty-three".