161779271158 has 64 divisors (see below), whose sum is σ = 266332746240. Its totient is φ = 73436170752.

The previous prime is 161779271131. The next prime is 161779271161. The reversal of 161779271158 is 851172977161.

It is a junction number, because it is equal to n+sod(n) for n = 161779271099 and 161779271108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25893991 + ... + 25900237.

It is an arithmetic number, because the mean of its divisors is an integer number (4161449160).

Almost surely, 2^161779271158 is an apocalyptic number.

161779271158 is a deficient number, since it is larger than the sum of its proper divisors (104553475082).

161779271158 is a wasteful number, since it uses less digits than its factorization.

161779271158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6581.

The product of its digits is 1481760, while the sum is 55.

The spelling of 161779271158 in words is "one hundred sixty-one billion, seven hundred seventy-nine million, two hundred seventy-one thousand, one hundred fifty-eight".