18870872408477 has 4 divisors (see below), whose sum is σ = 18870882090240. Its totient is φ = 18870862726716.

The previous prime is 18870872408473. The next prime is 18870872408483. The reversal of 18870872408477 is 77480427807881.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18870872408477 - 2² = 18870872408473 is a prime.

It is a super-2 number, since 2×18870872408477² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18870872408477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18870872408473) 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, 783827 + ... + 6193232.

It is an arithmetic number, because the mean of its divisors is an integer number (4717720522560).

Almost surely, 2^{18870872408477} is an apocalyptic number.

It is an amenable number.

18870872408477 is a deficient number, since it is larger than the sum of its proper divisors (9681763).

18870872408477 is an equidigital number, since it uses as much as digits as its factorization.

18870872408477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9681762.

The product of its (nonzero) digits is 314703872, while the sum is 71.

The spelling of 18870872408477 in words is "eighteen trillion, eight hundred seventy billion, eight hundred seventy-two million, four hundred eight thousand, four hundred seventy-seven".