164781661071 has 4 divisors (see below), whose sum is σ = 219708881432. Its totient is φ = 109854440712.

The previous prime is 164781661061. The next prime is 164781661073. The reversal of 164781661071 is 170166187461.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 164781661071 - 2¹³ = 164781652879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 164781661071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164781661073) 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, 27463610176 + ... + 27463610181.

It is an arithmetic number, because the mean of its divisors is an integer number (54927220358).

Almost surely, 2^164781661071 is an apocalyptic number.

164781661071 is a deficient number, since it is larger than the sum of its proper divisors (54927220361).

164781661071 is an equidigital number, since it uses as much as digits as its factorization.

164781661071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54927220360.

The product of its (nonzero) digits is 338688, while the sum is 48.

The spelling of 164781661071 in words is "one hundred sixty-four billion, seven hundred eighty-one million, six hundred sixty-one thousand, seventy-one".