18913927215477 has 32 divisors (see below), whose sum is σ = 29258733883392. Its totient is φ = 10645059351744.

The previous prime is 18913927215427. The next prime is 18913927215593. The reversal of 18913927215477 is 77451272931981.

It is not a de Polignac number, because 18913927215477 - 2⁶ = 18913927215413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18913927215427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23939053 + ... + 24716514.

It is an arithmetic number, because the mean of its divisors is an integer number (914335433856).

Almost surely, 2^{18913927215477} is an apocalyptic number.

It is an amenable number.

18913927215477 is a deficient number, since it is larger than the sum of its proper divisors (10344806667915).

18913927215477 is a wasteful number, since it uses less digits than its factorization.

18913927215477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48655857.

The product of its digits is 53343360, while the sum is 66.

The spelling of 18913927215477 in words is "eighteen trillion, nine hundred thirteen billion, nine hundred twenty-seven million, two hundred fifteen thousand, four hundred seventy-seven".