217161162157 has 4 divisors (see below), whose sum is σ = 226602951840. Its totient is φ = 207719372476.

The previous prime is 217161162139. The next prime is 217161162167. The reversal of 217161162157 is 751261161712.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217161162157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217161162167) 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, 4720894807 + ... + 4720894852.

It is an arithmetic number, because the mean of its divisors is an integer number (56650737960).

Almost surely, 2^217161162157 is an apocalyptic number.

It is an amenable number.

217161162157 is a deficient number, since it is larger than the sum of its proper divisors (9441789683).

217161162157 is an equidigital number, since it uses as much as digits as its factorization.

217161162157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9441789682.

The product of its digits is 35280, while the sum is 40.

The spelling of 217161162157 in words is "two hundred seventeen billion, one hundred sixty-one million, one hundred sixty-two thousand, one hundred fifty-seven".