18959236645 has 8 divisors (see below), whose sum is σ = 22770355320. Its totient is φ = 15154541760.

The previous prime is 18959236643. The next prime is 18959236679. The reversal of 18959236645 is 54663295981.

It can be written as a sum of positive squares in 4 ways, for example, as 782264961 + 18176971684 = 27969^2 + 134822^2 .

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

It is not a de Polignac number, because 18959236645 - 2¹ = 18959236643 is a prime.

It is a super-2 number, since 2×18959236645² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18959236645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18959236643) 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, 1599450 + ... + 1611259.

It is an arithmetic number, because the mean of its divisors is an integer number (2846294415).

Almost surely, 2^18959236645 is an apocalyptic number.

It is an amenable number.

18959236645 is a deficient number, since it is larger than the sum of its proper divisors (3811118675).

18959236645 is a wasteful number, since it uses less digits than its factorization.

18959236645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211895.

The product of its digits is 13996800, while the sum is 58.

The spelling of 18959236645 in words is "eighteen billion, nine hundred fifty-nine million, two hundred thirty-six thousand, six hundred forty-five".