161506601602 has 8 divisors (see below), whose sum is σ = 242263362636. Its totient is φ = 80752147392.

The previous prime is 161506601591. The next prime is 161506601603. The reversal of 161506601602 is 206106605161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 116205310321 + 45301291281 = 340889^2 + 212841^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161506601602² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161506601603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389523 + ... + 689014.

Almost surely, 2^161506601602 is an apocalyptic number.

161506601602 is a deficient number, since it is larger than the sum of its proper divisors (80756761034).

161506601602 is a wasteful number, since it uses less digits than its factorization.

161506601602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153412.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 161506601602 in words is "one hundred sixty-one billion, five hundred six million, six hundred one thousand, six hundred two".