4660991978 has 4 divisors (see below), whose sum is σ = 6991487970. Its totient is φ = 2330495988.

The previous prime is 4660991977. The next prime is 4660992001. The reversal of 4660991978 is 8791990664.

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., 2559044569 + 2101947409 = 50587^2 + 45847^2 .

It is not an unprimeable number, because it can be changed into a prime (4660991977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1165247993 + ... + 1165247996.

Almost surely, 2^4660991978 is an apocalyptic number.

4660991978 is a deficient number, since it is larger than the sum of its proper divisors (2330495992).

4660991978 is a wasteful number, since it uses less digits than its factorization.

4660991978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2330495991.

The product of its (nonzero) digits is 5878656, while the sum is 59.

The square root of 4660991978 is about 68271.4580040591. The cubic root of 4660991978 is about 1670.4216820333.

The spelling of 4660991978 in words is "four billion, six hundred sixty million, nine hundred ninety-one thousand, nine hundred seventy-eight".