43409980778 has 4 divisors (see below), whose sum is σ = 65114971170. Its totient is φ = 21704990388.

The previous prime is 43409980771. The next prime is 43409980799. The reversal of 43409980778 is 87708990434.

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., 23312098489 + 20097882289 = 152683^2 + 141767^2 .

It is a super-2 number, since 2×43409980778² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43409980771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10852495193 + ... + 10852495196.

Almost surely, 2^43409980778 is an apocalyptic number.

43409980778 is a deficient number, since it is larger than the sum of its proper divisors (21704990392).

43409980778 is a wasteful number, since it uses less digits than its factorization.

43409980778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21704990391.

The product of its (nonzero) digits is 12192768, while the sum is 59.

The spelling of 43409980778 in words is "forty-three billion, four hundred nine million, nine hundred eighty thousand, seven hundred seventy-eight".