18712651745421 has 48 divisors (see below), whose sum is σ = 27897456053376. Its totient is φ = 12080852604288.

The previous prime is 18712651745419. The next prime is 18712651745429. The reversal of 18712651745421 is 12454715621781.

18712651745421 is a `hidden beast` number, since 1 + 8 + 7 + 1 + 26 + 5 + 1 + 74 + 542 + 1 = 666.

It is not a de Polignac number, because 18712651745421 - 2¹ = 18712651745419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18712651745429) 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 47 ways as a sum of consecutive naturals, for example, 41862915 + ... + 42307551.

It is an arithmetic number, because the mean of its divisors is an integer number (581197001112).

Almost surely, 2^{18712651745421} is an apocalyptic number.

It is an amenable number.

18712651745421 is a deficient number, since it is larger than the sum of its proper divisors (9184804307955).

18712651745421 is a wasteful number, since it uses less digits than its factorization.

18712651745421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445842 (or 445839 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 54.

The spelling of 18712651745421 in words is "eighteen trillion, seven hundred twelve billion, six hundred fifty-one million, seven hundred forty-five thousand, four hundred twenty-one".