161640015 has 8 divisors (see below), whose sum is σ = 258624048. Its totient is φ = 86208000.

The previous prime is 161640007. The next prime is 161640023. The reversal of 161640015 is 510046161.

It is an interprime number because it is at equal distance from previous prime (161640007) and next prime (161640023).

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

It is not a de Polignac number, because 161640015 - 2³ = 161640007 is a prime.

It is a super-2 number, since 2×161640015² = 52254988898400450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5387986 + ... + 5388015.

It is an arithmetic number, because the mean of its divisors is an integer number (32328006).

Almost surely, 2^161640015 is an apocalyptic number.

161640015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161640015 is a deficient number, since it is larger than the sum of its proper divisors (96984033).

161640015 is a wasteful number, since it uses less digits than its factorization.

161640015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10776009.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 161640015 is about 12713.7726501617. The cubic root of 161640015 is about 544.7320906393.

Adding to 161640015 its reverse (510046161), we get a palindrome (671686176).

The spelling of 161640015 in words is "one hundred sixty-one million, six hundred forty thousand, fifteen".