6620778261043 has 4 divisors (see below), whose sum is σ = 6620789759040. Its totient is φ = 6620766763048.

The previous prime is 6620778261007. The next prime is 6620778261067. The reversal of 6620778261043 is 3401628770266.

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

It is a cyclic number.

It is not a de Polignac number, because 6620778261043 - 2¹⁷ = 6620778129971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6620778261443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4837048 + ... + 6052981.

It is an arithmetic number, because the mean of its divisors is an integer number (1655197439760).

Almost surely, 2^{6620778261043} is an apocalyptic number.

6620778261043 is a deficient number, since it is larger than the sum of its proper divisors (11497997).

6620778261043 is a wasteful number, since it uses less digits than its factorization.

6620778261043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11497996.

The product of its (nonzero) digits is 4064256, while the sum is 52.

The spelling of 6620778261043 in words is "six trillion, six hundred twenty billion, seven hundred seventy-eight million, two hundred sixty-one thousand, forty-three".