161042644263 has 8 divisors (see below), whose sum is σ = 220526864368. Its totient is φ = 104460093504.

The previous prime is 161042644249. The next prime is 161042644267. The reversal of 161042644263 is 362446240161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161042644263 - 2¹³ = 161042636071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161042644267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725417206 + ... + 725417427.

It is an arithmetic number, because the mean of its divisors is an integer number (27565858046).

Almost surely, 2^161042644263 is an apocalyptic number.

161042644263 is a deficient number, since it is larger than the sum of its proper divisors (59484220105).

161042644263 is a wasteful number, since it uses less digits than its factorization.

161042644263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450834673.

The product of its (nonzero) digits is 165888, while the sum is 39.

The spelling of 161042644263 in words is "one hundred sixty-one billion, forty-two million, six hundred forty-four thousand, two hundred sixty-three".