1620908692841 has 2 divisors, whose sum is σ = 1620908692842. Its totient is φ = 1620908692840.

The previous prime is 1620908692811. The next prime is 1620908692849. The reversal of 1620908692841 is 1482968090261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1552463668441 + 68445024400 = 1245979^2 + 261620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1620908692841 is a prime.

It is not a weakly prime, because it can be changed into another prime (1620908692849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810454346420 + 810454346421.

It is an arithmetic number, because the mean of its divisors is an integer number (810454346421).

Almost surely, 2^{1620908692841} is an apocalyptic number.

It is an amenable number.

1620908692841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620908692841 is an equidigital number, since it uses as much as digits as its factorization.

1620908692841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2985984, while the sum is 56.

The spelling of 1620908692841 in words is "one trillion, six hundred twenty billion, nine hundred eight million, six hundred ninety-two thousand, eight hundred forty-one".