18625421773 has 8 divisors (see below), whose sum is σ = 21287364480. Its totient is φ = 15963771120.

The previous prime is 18625421753. The next prime is 18625421777. The reversal of 18625421773 is 37712452681.

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 18625421773 - 2⁵ = 18625421741 is a prime.

It is a super-4 number, since 4×18625421773⁴ (a number of 42 digits) contains 4444 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 (18625421777) 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, 87048 + ... + 211726.

It is an arithmetic number, because the mean of its divisors is an integer number (2660920560).

Almost surely, 2^18625421773 is an apocalyptic number.

It is an amenable number.

18625421773 is a deficient number, since it is larger than the sum of its proper divisors (2661942707).

18625421773 is a wasteful number, since it uses less digits than its factorization.

18625421773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146027.

The product of its digits is 564480, while the sum is 46.

The spelling of 18625421773 in words is "eighteen billion, six hundred twenty-five million, four hundred twenty-one thousand, seven hundred seventy-three".