161651677 has 8 divisors (see below), whose sum is σ = 185628960. Its totient is φ = 139221360.

The previous prime is 161651669. The next prime is 161651683. The reversal of 161651677 is 776156161.

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

It is not a de Polignac number, because 161651677 - 2³ = 161651669 is a prime.

It is a super-2 number, since 2×161651677² = 52262529353824658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161651627) 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, 386518 + ... + 386935.

It is an arithmetic number, because the mean of its divisors is an integer number (23203620).

Almost surely, 2^161651677 is an apocalyptic number.

It is an amenable number.

161651677 is a deficient number, since it is larger than the sum of its proper divisors (23977283).

161651677 is a wasteful number, since it uses less digits than its factorization.

161651677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773483.

The product of its digits is 52920, while the sum is 40.

The square root of 161651677 is about 12714.2312783746. The cubic root of 161651677 is about 544.7451907636.

The spelling of 161651677 in words is "one hundred sixty-one million, six hundred fifty-one thousand, six hundred seventy-seven".