161761604 has 6 divisors (see below), whose sum is σ = 283082814. Its totient is φ = 80880800.

The previous prime is 161761597. The next prime is 161761609. The reversal of 161761604 is 406167161.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 157753600 + 4008004 = 12560^2 + 2002^2 .

It is not an unprimeable number, because it can be changed into a prime (161761609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20220197 + ... + 20220204.

It is an arithmetic number, because the mean of its divisors is an integer number (47180469).

Almost surely, 2^161761604 is an apocalyptic number.

It is an amenable number.

161761604 is a deficient number, since it is larger than the sum of its proper divisors (121321210).

161761604 is a wasteful number, since it uses less digits than its factorization.

161761604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40440405 (or 40440403 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 161761604 is about 12718.5535341091. The cubic root of 161761604 is about 544.8686426965.

The spelling of 161761604 in words is "one hundred sixty-one million, seven hundred sixty-one thousand, six hundred four".