243148799977 has 2 divisors, whose sum is σ = 243148799978. Its totient is φ = 243148799976.

The previous prime is 243148799963. The next prime is 243148800001. The reversal of 243148799977 is 779997841342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211941457641 + 31207342336 = 460371^2 + 176656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243148799977 is a prime.

It is not a weakly prime, because it can be changed into another prime (243148793977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121574399988 + 121574399989.

It is an arithmetic number, because the mean of its divisors is an integer number (121574399989).

Almost surely, 2^243148799977 is an apocalyptic number.

It is an amenable number.

243148799977 is a deficient number, since it is larger than the sum of its proper divisors (1).

243148799977 is an equidigital number, since it uses as much as digits as its factorization.

243148799977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192036096, while the sum is 70.

The spelling of 243148799977 in words is "two hundred forty-three billion, one hundred forty-eight million, seven hundred ninety-nine thousand, nine hundred seventy-seven".