161866677 has 16 divisors (see below), whose sum is σ = 250836480. Its totient is φ = 90926832.

The previous prime is 161866667. The next prime is 161866693. The reversal of 161866677 is 776668161.

It is not a de Polignac number, because 161866677 - 2⁸ = 161866421 is a prime.

It is a super-2 number, since 2×161866677² = 52401642246044658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161866667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64083 + ... + 66560.

It is an arithmetic number, because the mean of its divisors is an integer number (15677280).

Almost surely, 2^161866677 is an apocalyptic number.

It is an amenable number.

161866677 is a deficient number, since it is larger than the sum of its proper divisors (88969803).

161866677 is a wasteful number, since it uses less digits than its factorization.

161866677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130712.

The product of its digits is 508032, while the sum is 48.

The square root of 161866677 is about 12722.6835612618. The cubic root of 161866677 is about 544.9865911467.

The spelling of 161866677 in words is "one hundred sixty-one million, eight hundred sixty-six thousand, six hundred seventy-seven".