161640053 has 8 divisors (see below), whose sum is σ = 166273536. Its totient is φ = 157046400.

The previous prime is 161640047. The next prime is 161640071. The reversal of 161640053 is 350046161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161640053 is a prime.

It is a super-2 number, since 2×161640053² = 52255013467685618, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161640023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1628 + ... + 18053.

It is an arithmetic number, because the mean of its divisors is an integer number (20784192).

Almost surely, 2^161640053 is an apocalyptic number.

It is an amenable number.

161640053 is a deficient number, since it is larger than the sum of its proper divisors (4633483).

161640053 is a wasteful number, since it uses less digits than its factorization.

161640053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19915.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 161640053 is about 12713.7741446040. The cubic root of 161640053 is about 544.7321333264.

The spelling of 161640053 in words is "one hundred sixty-one million, six hundred forty thousand, fifty-three".