161247425461 has 4 divisors (see below), whose sum is σ = 164997365632. Its totient is φ = 157497485292.

The previous prime is 161247425447. The next prime is 161247425477. The reversal of 161247425461 is 164524742161.

161247425461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 161247425461 - 2¹¹ = 161247423413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 3749940127 = 161247425461 / (1 + 6 + 1 + 2 + 4 + 7 + 4 + 2 + 5 + 4 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161247425411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1874970021 + ... + 1874970106.

It is an arithmetic number, because the mean of its divisors is an integer number (41249341408).

Almost surely, 2^161247425461 is an apocalyptic number.

It is an amenable number.

161247425461 is a deficient number, since it is larger than the sum of its proper divisors (3749940171).

161247425461 is an equidigital number, since it uses as much as digits as its factorization.

161247425461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3749940170.

The product of its digits is 322560, while the sum is 43.

The spelling of 161247425461 in words is "one hundred sixty-one billion, two hundred forty-seven million, four hundred twenty-five thousand, four hundred sixty-one".