161911678 has 8 divisors (see below), whose sum is σ = 243023472. Its totient is φ = 80903856.

The previous prime is 161911657. The next prime is 161911699. The reversal of 161911678 is 876119161.

It is an interprime number because it is at equal distance from previous prime (161911657) and next prime (161911699).

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

It is a self number, because there is not a number n which added to its sum of digits gives 161911678.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21975 + ... + 28402.

It is an arithmetic number, because the mean of its divisors is an integer number (30377934).

Almost surely, 2^161911678 is an apocalyptic number.

161911678 is a deficient number, since it is larger than the sum of its proper divisors (81111794).

161911678 is a wasteful number, since it uses less digits than its factorization.

161911678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51986.

The product of its digits is 18144, while the sum is 40.

The square root of 161911678 is about 12724.4519724820. The cubic root of 161911678 is about 545.0370908741.

The spelling of 161911678 in words is "one hundred sixty-one million, nine hundred eleven thousand, six hundred seventy-eight".