161530668101 has 4 divisors (see below), whose sum is σ = 176215274304. Its totient is φ = 146846061900.

The previous prime is 161530668097. The next prime is 161530668139. The reversal of 161530668101 is 101866035161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 101866035161 = 11 ⋅9260548651.

It is a cyclic number.

It is not a de Polignac number, because 161530668101 - 2² = 161530668097 is a prime.

It is a super-4 number, since 4×161530668101⁴ (a number of 46 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161530658101) 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, 7342303085 + ... + 7342303106.

It is an arithmetic number, because the mean of its divisors is an integer number (44053818576).

Almost surely, 2^161530668101 is an apocalyptic number.

161530668101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161530668101 is a deficient number, since it is larger than the sum of its proper divisors (14684606203).

161530668101 is a wasteful number, since it uses less digits than its factorization.

161530668101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14684606202.

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 161530668101 in words is "one hundred sixty-one billion, five hundred thirty million, six hundred sixty-eight thousand, one hundred one".