18951953512 has 16 divisors (see below), whose sum is σ = 35537402340. Its totient is φ = 9475312896.

The previous prime is 18951953393. The next prime is 18951953513. The reversal of 18951953512 is 21535915981.

It can be written as a sum of positive squares in 2 ways, for example, as 18630612036 + 321341476 = 136494^2 + 17926^2 .

It is not an unprimeable number, because it can be changed into a prime (18951953513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51088 + ... + 201280.

Almost surely, 2^18951953512 is an apocalyptic number.

It is an amenable number.

18951953512 is a deficient number, since it is larger than the sum of its proper divisors (16585448828).

18951953512 is a wasteful number, since it uses less digits than its factorization.

18951953512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165972 (or 165968 counting only the distinct ones).

The product of its digits is 486000, while the sum is 49.

The spelling of 18951953512 in words is "eighteen billion, nine hundred fifty-one million, nine hundred fifty-three thousand, five hundred twelve".