161494726737 has 4 divisors (see below), whose sum is σ = 215326302320. Its totient is φ = 107663151156.

The previous prime is 161494726733. The next prime is 161494726747. The reversal of 161494726737 is 737627494161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 737627494161 = 3 ⋅245875831387.

It is not a de Polignac number, because 161494726737 - 2² = 161494726733 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161494726733) 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, 26915787787 + ... + 26915787792.

It is an arithmetic number, because the mean of its divisors is an integer number (53831575580).

Almost surely, 2^161494726737 is an apocalyptic number.

It is an amenable number.

161494726737 is a deficient number, since it is larger than the sum of its proper divisors (53831575583).

161494726737 is an equidigital number, since it uses as much as digits as its factorization.

161494726737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53831575582.

The product of its digits is 10668672, while the sum is 57.

The spelling of 161494726737 in words is "one hundred sixty-one billion, four hundred ninety-four million, seven hundred twenty-six thousand, seven hundred thirty-seven".