161723877 has 16 divisors (see below), whose sum is σ = 259407360. Its totient is φ = 87549552.

The previous prime is 161723843. The next prime is 161723911. The reversal of 161723877 is 778327161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (161723843) and next prime (161723911).

It is not a de Polignac number, because 161723877 - 2⁶ = 161723813 is a prime.

It is a super-4 number, since 4×161723877⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3, 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161723077) 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, 202263 + ... + 203060.

It is an arithmetic number, because the mean of its divisors is an integer number (16212960).

Almost surely, 2^161723877 is an apocalyptic number.

It is an amenable number.

161723877 is a deficient number, since it is larger than the sum of its proper divisors (97683483).

161723877 is a wasteful number, since it uses less digits than its factorization.

161723877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405352.

The product of its digits is 98784, while the sum is 42.

The square root of 161723877 is about 12717.0702994047. The cubic root of 161723877 is about 544.8262802383.

The spelling of 161723877 in words is "one hundred sixty-one million, seven hundred twenty-three thousand, eight hundred seventy-seven".