164623553 has 4 divisors (see below), whose sum is σ = 164649408. Its totient is φ = 164597700.

The previous prime is 164623549. The next prime is 164623559. The reversal of 164623553 is 355326461.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 355326461 = 7 ⋅50760923.

It is a cyclic number.

It is not a de Polignac number, because 164623553 - 2² = 164623549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164623559) 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, 4100 + ... + 18602.

It is an arithmetic number, because the mean of its divisors is an integer number (41162352).

Almost surely, 2^164623553 is an apocalyptic number.

It is an amenable number.

164623553 is a deficient number, since it is larger than the sum of its proper divisors (25855).

164623553 is a wasteful number, since it uses less digits than its factorization.

164623553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25854.

The product of its digits is 64800, while the sum is 35.

The square root of 164623553 is about 12830.5710317195. The cubic root of 164623553 is about 548.0632186377.

The spelling of 164623553 in words is "one hundred sixty-four million, six hundred twenty-three thousand, five hundred fifty-three".