10665660778 has 8 divisors (see below), whose sum is σ = 16260761700. Its totient is φ = 5245406880.

The previous prime is 10665660751. The next prime is 10665660781. The reversal of 10665660778 is 87706656601.

It can be written as a sum of positive squares in 2 ways, for example, as 9497866849 + 1167793929 = 97457^2 + 34173^2 .

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

It is a super-2 number, since 2×10665660778² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43711603 + ... + 43711846.

Almost surely, 2^10665660778 is an apocalyptic number.

10665660778 is a deficient number, since it is larger than the sum of its proper divisors (5595100922).

10665660778 is an equidigital number, since it uses as much as digits as its factorization.

10665660778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87423512.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 10665660778 in words is "ten billion, six hundred sixty-five million, six hundred sixty thousand, seven hundred seventy-eight".