161660432739 has 32 divisors (see below), whose sum is σ = 240016896000. Its totient is φ = 96113047680.

The previous prime is 161660432729. The next prime is 161660432771. The reversal of 161660432739 is 937234066161.

It is not a de Polignac number, because 161660432739 - 2⁷ = 161660432611 is a prime.

It is a super-2 number, since 2×161660432739² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161660432729) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 612577 + ... + 835805.

It is an arithmetic number, because the mean of its divisors is an integer number (7500528000).

Almost surely, 2^161660432739 is an apocalyptic number.

161660432739 is a deficient number, since it is larger than the sum of its proper divisors (78356463261).

161660432739 is a wasteful number, since it uses less digits than its factorization.

161660432739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223875.

The product of its (nonzero) digits is 979776, while the sum is 48.

The spelling of 161660432739 in words is "one hundred sixty-one billion, six hundred sixty million, four hundred thirty-two thousand, seven hundred thirty-nine".