161398635602 has 4 divisors (see below), whose sum is σ = 242097953406. Its totient is φ = 80699317800.

The previous prime is 161398635599. The next prime is 161398635667. The reversal of 161398635602 is 206536893161.

It is a happy number.

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., 156270786721 + 5127848881 = 395311^2 + 71609^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40349658899 + ... + 40349658902.

Almost surely, 2^161398635602 is an apocalyptic number.

161398635602 is a deficient number, since it is larger than the sum of its proper divisors (80699317804).

161398635602 is an equidigital number, since it uses as much as digits as its factorization.

161398635602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80699317803.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 161398635602 in words is "one hundred sixty-one billion, three hundred ninety-eight million, six hundred thirty-five thousand, six hundred two".