18779413443 has 32 divisors (see below), whose sum is σ = 30312382464. Its totient is φ = 10095578112.

The previous prime is 18779413427. The next prime is 18779413481. The reversal of 18779413443 is 34431497781.

It is a Cunningham number, because it is equal to 137038²-1.

It is not a de Polignac number, because 18779413443 - 2⁴ = 18779413427 is a prime.

It is a super-2 number, since 2×18779413443² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (18779413343) 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, 949471 + ... + 969047.

It is an arithmetic number, because the mean of its divisors is an integer number (947261952).

Almost surely, 2^18779413443 is an apocalyptic number.

18779413443 is a deficient number, since it is larger than the sum of its proper divisors (11532969021).

18779413443 is a wasteful number, since it uses less digits than its factorization.

18779413443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22291.

The product of its digits is 2032128, while the sum is 51.

The spelling of 18779413443 in words is "eighteen billion, seven hundred seventy-nine million, four hundred thirteen thousand, four hundred forty-three".