618231987061 has 8 divisors (see below), whose sum is σ = 665794939320. Its totient is φ = 570669984192.

The previous prime is 618231987059. The next prime is 618231987161. The reversal of 618231987061 is 160789132816.

It can be written as a sum of positive squares in 4 ways, for example, as 899640036 + 617332347025 = 29994^2 + 785705^2 .

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 618231987061 - 2¹ = 618231987059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618231987001) 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, 1702191 + ... + 2033203.

It is an arithmetic number, because the mean of its divisors is an integer number (83224367415).

Almost surely, 2^618231987061 is an apocalyptic number.

It is an amenable number.

618231987061 is a deficient number, since it is larger than the sum of its proper divisors (47562952259).

618231987061 is a wasteful number, since it uses less digits than its factorization.

618231987061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474695.

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 618231987061 in words is "six hundred eighteen billion, two hundred thirty-one million, nine hundred eighty-seven thousand, sixty-one".