161154640473 has 4 divisors (see below), whose sum is σ = 214872853968. Its totient is φ = 107436426980.

The previous prime is 161154640469. The next prime is 161154640489. The reversal of 161154640473 is 374046451161.

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.

It is a cyclic number.

It is not a de Polignac number, because 161154640473 - 2² = 161154640469 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161154640453) 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, 26859106743 + ... + 26859106748.

It is an arithmetic number, because the mean of its divisors is an integer number (53718213492).

Almost surely, 2^161154640473 is an apocalyptic number.

It is an amenable number.

161154640473 is a deficient number, since it is larger than the sum of its proper divisors (53718213495).

161154640473 is an equidigital number, since it uses as much as digits as its factorization.

161154640473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53718213494.

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 161154640473 in words is "one hundred sixty-one billion, one hundred fifty-four million, six hundred forty thousand, four hundred seventy-three".