11649710978 has 4 divisors (see below), whose sum is σ = 17474566470. Its totient is φ = 5824855488.

The previous prime is 11649710971. The next prime is 11649710983. The reversal of 11649710978 is 87901794611.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11630112649 + 19598329 = 107843^2 + 4427^2 .

It is not an unprimeable number, because it can be changed into a prime (11649710971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2912427743 + ... + 2912427746.

Almost surely, 2^11649710978 is an apocalyptic number.

11649710978 is a deficient number, since it is larger than the sum of its proper divisors (5824855492).

11649710978 is an equidigital number, since it uses as much as digits as its factorization.

11649710978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5824855491.

The product of its (nonzero) digits is 762048, while the sum is 53.

The spelling of 11649710978 in words is "eleven billion, six hundred forty-nine million, seven hundred ten thousand, nine hundred seventy-eight".