6550541978 has 4 divisors (see below), whose sum is σ = 9825812970. Its totient is φ = 3275270988.

The previous prime is 6550541971. The next prime is 6550541989. The reversal of 6550541978 is 8791450556.

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., 5659101529 + 891440449 = 75227^2 + 29857^2 .

It is not an unprimeable number, because it can be changed into a prime (6550541971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1637635493 + ... + 1637635496.

Almost surely, 2^6550541978 is an apocalyptic number.

6550541978 is a deficient number, since it is larger than the sum of its proper divisors (3275270992).

6550541978 is a wasteful number, since it uses less digits than its factorization.

6550541978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3275270991.

The product of its (nonzero) digits is 1512000, while the sum is 50.

The square root of 6550541978 is about 80935.4185631977. The cubic root of 6550541978 is about 1871.0802358639.

The spelling of 6550541978 in words is "six billion, five hundred fifty million, five hundred forty-one thousand, nine hundred seventy-eight".