118415821457 has 8 divisors (see below), whose sum is σ = 119194999656. Its totient is φ = 117636959232.

The previous prime is 118415821429. The next prime is 118415821463. The reversal of 118415821457 is 754128514811.

It is a Cunningham number, because it is equal to 344116²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 34709180416 + 83706641041 = 186304^2 + 289321^2 .

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 118415821457 - 2¹⁰ = 118415820433 is a prime.

It is a super-2 number, since 2×118415821457² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118415841457) 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, 698033 + ... + 850929.

It is an arithmetic number, because the mean of its divisors is an integer number (14899374957).

Almost surely, 2^118415821457 is an apocalyptic number.

It is an amenable number.

118415821457 is a deficient number, since it is larger than the sum of its proper divisors (779178199).

118415821457 is a wasteful number, since it uses less digits than its factorization.

118415821457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157987.

The product of its digits is 358400, while the sum is 47.

The spelling of 118415821457 in words is "one hundred eighteen billion, four hundred fifteen million, eight hundred twenty-one thousand, four hundred fifty-seven".