18946690506 has 32 divisors (see below), whose sum is σ = 42108292800. Its totient is φ = 6314883120.

The previous prime is 18946690501. The next prime is 18946690513. The reversal of 18946690506 is 60509664981.

It is a happy number.

18946690506 is a `hidden beast` number, since 1 + 8 + 9 + 46 + 6 + 90 + 506 = 666.

It is a super-2 number, since 2×18946690506² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (18946690501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 873865 + ... + 895283.

It is an arithmetic number, because the mean of its divisors is an integer number (1315884150).

Almost surely, 2^18946690506 is an apocalyptic number.

18946690506 is an abundant number, since it is smaller than the sum of its proper divisors (23161602294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18946690506 is a wasteful number, since it uses less digits than its factorization.

18946690506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37811 (or 37805 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

It can be divided in two parts, 189466 and 90506, that added together give a palindrome (279972).

The spelling of 18946690506 in words is "eighteen billion, nine hundred forty-six million, six hundred ninety thousand, five hundred six".