18490996325477 has 16 divisors (see below), whose sum is σ = 20072703000000. Its totient is φ = 16932246649344.

The previous prime is 18490996325443. The next prime is 18490996325561. The reversal of 18490996325477 is 77452369909481.

It is not a de Polignac number, because 18490996325477 - 2¹⁰ = 18490996324453 is a prime.

It is a super-2 number, since 2×18490996325477² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (74) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18490996325377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1839527 + ... + 6353412.

It is an arithmetic number, because the mean of its divisors is an integer number (1254543937500).

It is a 1-persistent number, because it is pandigital, but 2⋅18490996325477 = 36981992650954 is not.

Almost surely, 2^{18490996325477} is an apocalyptic number.

It is an amenable number.

18490996325477 is a deficient number, since it is larger than the sum of its proper divisors (1581706674523).

18490996325477 is a wasteful number, since it uses less digits than its factorization.

18490996325477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8194340.

The product of its (nonzero) digits is 823011840, while the sum is 74.

The spelling of 18490996325477 in words is "eighteen trillion, four hundred ninety billion, nine hundred ninety-six million, three hundred twenty-five thousand, four hundred seventy-seven".