18770671981 has 8 divisors (see below), whose sum is σ = 18840029120. Its totient is φ = 18701419968.

The previous prime is 18770671973. The next prime is 18770671993. The reversal of 18770671981 is 18917607781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18770671981 - 2³ = 18770671973 is a prime.

It is a super-2 number, since 2×18770671981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18770678981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340885 + ... + 392101.

It is an arithmetic number, because the mean of its divisors is an integer number (2355003640).

Almost surely, 2^18770671981 is an apocalyptic number.

It is an amenable number.

18770671981 is a deficient number, since it is larger than the sum of its proper divisors (69357139).

18770671981 is an equidigital number, since it uses as much as digits as its factorization.

18770671981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52563.

The product of its (nonzero) digits is 1185408, while the sum is 55.

The spelling of 18770671981 in words is "eighteen billion, seven hundred seventy million, six hundred seventy-one thousand, nine hundred eighty-one".