161367659781 has 8 divisors (see below), whose sum is σ = 215159131680. Its totient is φ = 107577313872.

The previous prime is 161367659767. The next prime is 161367659819. The reversal of 161367659781 is 187956763161.

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

It is not a de Polignac number, because 161367659781 - 2¹⁹ = 161367135493 is a prime.

It is a super-2 number, since 2×161367659781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161367659681) 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, 145375 + ... + 586403.

It is an arithmetic number, because the mean of its divisors is an integer number (26894891460).

Almost surely, 2^161367659781 is an apocalyptic number.

It is an amenable number.

161367659781 is a deficient number, since it is larger than the sum of its proper divisors (53791471899).

161367659781 is a wasteful number, since it uses less digits than its factorization.

161367659781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562995.

The product of its digits is 11430720, while the sum is 60.

The spelling of 161367659781 in words is "one hundred sixty-one billion, three hundred sixty-seven million, six hundred fifty-nine thousand, seven hundred eighty-one".