18946690497 has 36 divisors (see below), whose sum is σ = 31884248916. Its totient is φ = 10810134720.

The previous prime is 18946690481. The next prime is 18946690501. The reversal of 18946690497 is 79409664981.

18946690497 is a `hidden beast` number, since 1 + 89 + 4 + 6 + 69 + 0 + 497 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8340986241 + 10605704256 = 91329^2 + 102984^2 .

It is not a de Polignac number, because 18946690497 - 2⁴ = 18946690481 is a prime.

It is a super-2 number, since 2×18946690497² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (18946690597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 259003 + ... + 323999.

It is an arithmetic number, because the mean of its divisors is an integer number (885673581).

Almost surely, 2^18946690497 is an apocalyptic number.

It is an amenable number.

18946690497 is a deficient number, since it is larger than the sum of its proper divisors (12937558419).

18946690497 is a wasteful number, since it uses less digits than its factorization.

18946690497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65678 (or 65668 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 63.

The spelling of 18946690497 in words is "eighteen billion, nine hundred forty-six million, six hundred ninety thousand, four hundred ninety-seven".