43207657991 has 2 divisors, whose sum is σ = 43207657992. Its totient is φ = 43207657990.

The previous prime is 43207657957. The next prime is 43207658003. The reversal of 43207657991 is 19975670234.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43207657991 - 2³⁴ = 26027788807 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43207657901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21603828995 + 21603828996.

It is an arithmetic number, because the mean of its divisors is an integer number (21603828996).

Almost surely, 2^43207657991 is an apocalyptic number.

43207657991 is a deficient number, since it is larger than the sum of its proper divisors (1).

43207657991 is an equidigital number, since it uses as much as digits as its factorization.

43207657991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2857680, while the sum is 53.

The spelling of 43207657991 in words is "forty-three billion, two hundred seven million, six hundred fifty-seven thousand, nine hundred ninety-one".