161966977 has 8 divisors (see below), whose sum is σ = 164954880. Its totient is φ = 158987280.

The previous prime is 161966969. The next prime is 161966983. The reversal of 161966977 is 779669161.

161966977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 161966977 - 2³ = 161966969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161966927) 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, 49327 + ... + 52507.

It is an arithmetic number, because the mean of its divisors is an integer number (20619360).

Almost surely, 2^161966977 is an apocalyptic number.

It is an amenable number.

161966977 is a deficient number, since it is larger than the sum of its proper divisors (2987903).

161966977 is an equidigital number, since it uses as much as digits as its factorization.

161966977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4103.

The product of its digits is 857304, while the sum is 52.

The square root of 161966977 is about 12726.6247292831. The cubic root of 161966977 is about 545.0991341144.

The spelling of 161966977 in words is "one hundred sixty-one million, nine hundred sixty-six thousand, nine hundred seventy-seven".