161550109451 has 2 divisors, whose sum is σ = 161550109452. Its totient is φ = 161550109450.

The previous prime is 161550109439. The next prime is 161550109459. The reversal of 161550109451 is 154901055161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161550109451 is a prime.

It is not a weakly prime, because it can be changed into another prime (161550109459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80775054725 + 80775054726.

It is an arithmetic number, because the mean of its divisors is an integer number (80775054726).

Almost surely, 2^161550109451 is an apocalyptic number.

161550109451 is a deficient number, since it is larger than the sum of its proper divisors (1).

161550109451 is an equidigital number, since it uses as much as digits as its factorization.

161550109451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 38.

The spelling of 161550109451 in words is "one hundred sixty-one billion, five hundred fifty million, one hundred nine thousand, four hundred fifty-one".