161754408839 has 2 divisors, whose sum is σ = 161754408840. Its totient is φ = 161754408838.

The previous prime is 161754408821. The next prime is 161754408847. The reversal of 161754408839 is 938804457161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161754408839 - 2²⁴ = 161737631623 is a prime.

It is a super-2 number, since 2×161754408839² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161754408869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80877204419 + 80877204420.

It is an arithmetic number, because the mean of its divisors is an integer number (80877204420).

Almost surely, 2^161754408839 is an apocalyptic number.

161754408839 is a deficient number, since it is larger than the sum of its proper divisors (1).

161754408839 is an equidigital number, since it uses as much as digits as its factorization.

161754408839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 161754408839 in words is "one hundred sixty-one billion, seven hundred fifty-four million, four hundred eight thousand, eight hundred thirty-nine".