918399638690 has 16 divisors (see below), whose sum is σ = 1660532444928. Its totient is φ = 365712500976.

The previous prime is 918399638683. The next prime is 918399638701. The reversal of 918399638690 is 96836993819.

918399638690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×918399638690² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205916972 + ... + 205921431.

It is an arithmetic number, because the mean of its divisors is an integer number (103783277808).

Almost surely, 2^918399638690 is an apocalyptic number.

918399638690 is a deficient number, since it is larger than the sum of its proper divisors (742132806238).

918399638690 is a wasteful number, since it uses less digits than its factorization.

918399638690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411838633.

The product of its (nonzero) digits is 136048896, while the sum is 71.

The spelling of 918399638690 in words is "nine hundred eighteen billion, three hundred ninety-nine million, six hundred thirty-eight thousand, six hundred ninety".