161562506503 has 2 divisors, whose sum is σ = 161562506504. Its totient is φ = 161562506502.

The previous prime is 161562506471. The next prime is 161562506519. The reversal of 161562506503 is 305605265161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161562506503 - 2⁵ = 161562506471 is a prime.

It is a super-2 number, since 2×161562506503² (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 (161562536503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80781253251 + 80781253252.

It is an arithmetic number, because the mean of its divisors is an integer number (80781253252).

Almost surely, 2^161562506503 is an apocalyptic number.

161562506503 is a deficient number, since it is larger than the sum of its proper divisors (1).

161562506503 is an equidigital number, since it uses as much as digits as its factorization.

161562506503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 161562506503 in words is "one hundred sixty-one billion, five hundred sixty-two million, five hundred six thousand, five hundred three".