164645263501 has 4 divisors (see below), whose sum is σ = 164673447552. Its totient is φ = 164617079452.

The previous prime is 164645263499. The next prime is 164645263513. The reversal of 164645263501 is 105362546461.

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, and also an emirpimes, since its reverse is a distinct semiprime: 105362546461 = 491 ⋅214587671.

It is a cyclic number.

It is not a de Polignac number, because 164645263501 - 2¹ = 164645263499 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 (164645264501) 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, 14083261 + ... + 14094946.

It is an arithmetic number, because the mean of its divisors is an integer number (41168361888).

Almost surely, 2^164645263501 is an apocalyptic number.

It is an amenable number.

164645263501 is a deficient number, since it is larger than the sum of its proper divisors (28184051).

164645263501 is an equidigital number, since it uses as much as digits as its factorization.

164645263501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28184050.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 164645263501 in words is "one hundred sixty-four billion, six hundred forty-five million, two hundred sixty-three thousand, five hundred one".