164625621701 has 4 divisors (see below), whose sum is σ = 164634117804. Its totient is φ = 164617125600.

The previous prime is 164625621673. The next prime is 164625621703. The reversal of 164625621701 is 107126526461.

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

It can be written as a sum of positive squares in 2 ways, for example, as 162530728801 + 2094892900 = 403151^2 + 45770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164625621701 is a prime.

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 (164625621703) 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, 4218920 + ... + 4257761.

It is an arithmetic number, because the mean of its divisors is an integer number (41158529451).

Almost surely, 2^164625621701 is an apocalyptic number.

It is an amenable number.

164625621701 is a deficient number, since it is larger than the sum of its proper divisors (8496103).

164625621701 is an equidigital number, since it uses as much as digits as its factorization.

164625621701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8496102.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 164625621701 in words is "one hundred sixty-four billion, six hundred twenty-five million, six hundred twenty-one thousand, seven hundred one".