161226777 has 8 divisors (see below), whose sum is σ = 216393280. Its totient is φ = 106772400.

The previous prime is 161226743. The next prime is 161226787. The reversal of 161226777 is 777622161.

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

It is not a de Polignac number, because 161226777 - 2⁶ = 161226713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161226727) 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, 177502 + ... + 178407.

It is an arithmetic number, because the mean of its divisors is an integer number (27049160).

Almost surely, 2^161226777 is an apocalyptic number.

It is an amenable number.

161226777 is a deficient number, since it is larger than the sum of its proper divisors (55166503).

161226777 is a wasteful number, since it uses less digits than its factorization.

161226777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356063.

The product of its digits is 49392, while the sum is 39.

The square root of 161226777 is about 12697.5106615431. The cubic root of 161226777 is about 544.2674860029.

The spelling of 161226777 in words is "one hundred sixty-one million, two hundred twenty-six thousand, seven hundred seventy-seven".