18797694949 has 4 divisors (see below), whose sum is σ = 20506576320. Its totient is φ = 17088813580.

The previous prime is 18797694947. The next prime is 18797694959. The reversal of 18797694949 is 94949679781.

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.

It is a cyclic number.

It is not a de Polignac number, because 18797694949 - 2¹ = 18797694947 is a prime.

It is a super-2 number, since 2×18797694949² (a number of 21 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 (18797694943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 854440669 + ... + 854440690.

It is an arithmetic number, because the mean of its divisors is an integer number (5126644080).

Almost surely, 2^18797694949 is an apocalyptic number.

It is an amenable number.

18797694949 is a deficient number, since it is larger than the sum of its proper divisors (1708881371).

18797694949 is a wasteful number, since it uses less digits than its factorization.

18797694949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708881370.

The product of its digits is 246903552, while the sum is 73.

The spelling of 18797694949 in words is "eighteen billion, seven hundred ninety-seven million, six hundred ninety-four thousand, nine hundred forty-nine".