164621043523 has 16 divisors (see below), whose sum is σ = 172808963712. Its totient is φ = 156642696000.

The previous prime is 164621043473. The next prime is 164621043539. The reversal of 164621043523 is 325340126461.

It is a cyclic number.

It is not a de Polignac number, because 164621043523 - 2¹³ = 164621035331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164621046523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1150668 + ... + 1285798.

It is an arithmetic number, because the mean of its divisors is an integer number (10800560232).

Almost surely, 2^164621043523 is an apocalyptic number.

164621043523 is a deficient number, since it is larger than the sum of its proper divisors (8187920189).

164621043523 is a wasteful number, since it uses less digits than its factorization.

164621043523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135906.

The product of its (nonzero) digits is 103680, while the sum is 37.

Adding to 164621043523 its reverse (325340126461), we get a palindrome (489961169984).

The spelling of 164621043523 in words is "one hundred sixty-four billion, six hundred twenty-one million, forty-three thousand, five hundred twenty-three".