9918556705 has 8 divisors (see below), whose sum is σ = 11903942952. Its totient is φ = 7933728768.

The previous prime is 9918556693. The next prime is 9918556709. The reversal of 9918556705 is 5076558199.

It can be written as a sum of positive squares in 4 ways, for example, as 51710481 + 9866846224 = 7191^2 + 99332^2 .

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 9918556705 - 2⁷ = 9918556577 is a prime.

It is a super-2 number, since 2×9918556705² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9918556709) 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, 99442 + ... + 172411.

It is an arithmetic number, because the mean of its divisors is an integer number (1487992869).

Almost surely, 2^9918556705 is an apocalyptic number.

It is an amenable number.

9918556705 is a deficient number, since it is larger than the sum of its proper divisors (1985386247).

9918556705 is a wasteful number, since it uses less digits than its factorization.

9918556705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279155.

The product of its (nonzero) digits is 3402000, while the sum is 55.

The square root of 9918556705 is about 99591.9510050888. The cubic root of 9918556705 is about 2148.5699309209.

The spelling of 9918556705 in words is "nine billion, nine hundred eighteen million, five hundred fifty-six thousand, seven hundred five".