161733420457 has 4 divisors (see below), whose sum is σ = 184838194816. Its totient is φ = 138628646100.

The previous prime is 161733420439. The next prime is 161733420461. The reversal of 161733420457 is 754024337161.

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: 754024337161 = 223303 ⋅3376687.

It is not a de Polignac number, because 161733420457 - 2¹¹ = 161733418409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161733420437) 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, 11552387169 + ... + 11552387182.

It is an arithmetic number, because the mean of its divisors is an integer number (46209548704).

Almost surely, 2^161733420457 is an apocalyptic number.

It is an amenable number.

161733420457 is a deficient number, since it is larger than the sum of its proper divisors (23104774359).

161733420457 is an equidigital number, since it uses as much as digits as its factorization.

161733420457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23104774358.

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 161733420457 in words is "one hundred sixty-one billion, seven hundred thirty-three million, four hundred twenty thousand, four hundred fifty-seven".