161625773503 has 4 divisors (see below), whose sum is σ = 163441793520. Its totient is φ = 159809753488.

The previous prime is 161625773473. The next prime is 161625773509. The reversal of 161625773503 is 305377526161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161625773503 is a prime.

It is a super-2 number, since 2×161625773503² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161625773509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 908009875 + ... + 908010052.

It is an arithmetic number, because the mean of its divisors is an integer number (40860448380).

Almost surely, 2^161625773503 is an apocalyptic number.

161625773503 is a deficient number, since it is larger than the sum of its proper divisors (1816020017).

161625773503 is an equidigital number, since it uses as much as digits as its factorization.

161625773503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816020016.

The product of its (nonzero) digits is 793800, while the sum is 46.

The spelling of 161625773503 in words is "one hundred sixty-one billion, six hundred twenty-five million, seven hundred seventy-three thousand, five hundred three".