161256204602 has 4 divisors (see below), whose sum is σ = 241884306906. Its totient is φ = 80628102300.

The previous prime is 161256204587. The next prime is 161256204607. The reversal of 161256204602 is 206402652161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 157576447681 + 3679756921 = 396959^2 + 60661^2 .

It is not an unprimeable number, because it can be changed into a prime (161256204607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40314051149 + ... + 40314051152.

Almost surely, 2^161256204602 is an apocalyptic number.

161256204602 is a deficient number, since it is larger than the sum of its proper divisors (80628102304).

161256204602 is an equidigital number, since it uses as much as digits as its factorization.

161256204602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80628102303.

The product of its (nonzero) digits is 34560, while the sum is 35.

Adding to 161256204602 its reverse (206402652161), we get a palindrome (367658856763).

The spelling of 161256204602 in words is "one hundred sixty-one billion, two hundred fifty-six million, two hundred four thousand, six hundred two".