161277516 has 72 divisors (see below), whose sum is σ = 418554864. Its totient is φ = 52341120.

The previous prime is 161277511. The next prime is 161277547. The reversal of 161277516 is 615772161.

161277516 is a `hidden beast` number, since 16 + 127 + 7 + 516 = 666.

161277516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (161277511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 345115 + ... + 345581.

It is an arithmetic number, because the mean of its divisors is an integer number (5813262).

Almost surely, 2^161277516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161277516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209277432).

161277516 is an abundant number, since it is smaller than the sum of its proper divisors (257277348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161277516 is a wasteful number, since it uses less digits than its factorization.

161277516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711 (or 706 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 161277516 is about 12699.5084944261. The cubic root of 161277516 is about 544.3245747241.

The spelling of 161277516 in words is "one hundred sixty-one million, two hundred seventy-seven thousand, five hundred sixteen".