99764177573 has 4 divisors (see below), whose sum is σ = 99764821068. Its totient is φ = 99763534080.

The previous prime is 99764177521. The next prime is 99764177609. The reversal of 99764177573 is 37577146799.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 37577146799 = 6737 ⋅5577727.

It can be written as a sum of positive squares in 2 ways, for example, as 46717796449 + 53046381124 = 216143^2 + 230318^2 .

It is a cyclic number.

It is not a de Polignac number, because 99764177573 - 2⁶ = 99764177509 is a prime.

It is a super-2 number, since 2×99764177573² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99764179573) 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, 68933 + ... + 451973.

It is an arithmetic number, because the mean of its divisors is an integer number (24941205267).

Almost surely, 2^99764177573 is an apocalyptic number.

It is an amenable number.

99764177573 is a deficient number, since it is larger than the sum of its proper divisors (643495).

99764177573 is a wasteful number, since it uses less digits than its factorization.

99764177573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643494.

The product of its digits is 70013160, while the sum is 65.

The spelling of 99764177573 in words is "ninety-nine billion, seven hundred sixty-four million, one hundred seventy-seven thousand, five hundred seventy-three".