18761958906 has 16 divisors (see below), whose sum is σ = 37529632800. Its totient is φ = 6253033808.

The previous prime is 18761958893. The next prime is 18761958907. The reversal of 18761958906 is 60985916781.

It is a super-2 number, since 2×18761958906² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18761958906.

It is not an unprimeable number, because it can be changed into a prime (18761958907) 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 7 ways as a sum of consecutive naturals, for example, 194841 + ... + 274748.

It is an arithmetic number, because the mean of its divisors is an integer number (2345602050).

Almost surely, 2^18761958906 is an apocalyptic number.

18761958906 is an abundant number, since it is smaller than the sum of its proper divisors (18767673894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18761958906 is a wasteful number, since it uses less digits than its factorization.

18761958906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476253.

The product of its (nonzero) digits is 6531840, while the sum is 60.

The spelling of 18761958906 in words is "eighteen billion, seven hundred sixty-one million, nine hundred fifty-eight thousand, nine hundred six".