161489678751 has 16 divisors (see below), whose sum is σ = 239323230720. Its totient is φ = 107624117880.

The previous prime is 161489678683. The next prime is 161489678761. The reversal of 161489678751 is 157876984161.

161489678751 is a `hidden beast` number, since 1 + 614 + 8 + 9 + 6 + 7 + 8 + 7 + 5 + 1 = 666.

It is not a de Polignac number, because 161489678751 - 2²¹ = 161487581599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161489678761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 907645 + ... + 1070886.

It is an arithmetic number, because the mean of its divisors is an integer number (14957701920).

Almost surely, 2^161489678751 is an apocalyptic number.

161489678751 is a deficient number, since it is larger than the sum of its proper divisors (77833551969).

161489678751 is a wasteful number, since it uses less digits than its factorization.

161489678751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981563 (or 1981557 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 63.

The spelling of 161489678751 in words is "one hundred sixty-one billion, four hundred eighty-nine million, six hundred seventy-eight thousand, seven hundred fifty-one".