1994618777 has 2 divisors, whose sum is σ = 1994618778. Its totient is φ = 1994618776.

The previous prime is 1994618767. The next prime is 1994618797. The reversal of 1994618777 is 7778164991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1990141321 + 4477456 = 44611^2 + 2116^2 .

It is an emirp because it is prime and its reverse (7778164991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1994618777 - 2¹⁸ = 1994356633 is a prime.

It is not a weakly prime, because it can be changed into another prime (1994618767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997309388 + 997309389.

It is an arithmetic number, because the mean of its divisors is an integer number (997309389).

Almost surely, 2^1994618777 is an apocalyptic number.

It is an amenable number.

1994618777 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994618777 is an equidigital number, since it uses as much as digits as its factorization.

1994618777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5334336, while the sum is 59.

The square root of 1994618777 is about 44661.1551238881. The cubic root of 1994618777 is about 1258.7900489042.

The spelling of 1994618777 in words is "one billion, nine hundred ninety-four million, six hundred eighteen thousand, seven hundred seventy-seven".