43207657957 has 2 divisors, whose sum is σ = 43207657958. Its totient is φ = 43207657956.

The previous prime is 43207657951. The next prime is 43207657991. The reversal of 43207657957 is 75975670234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43166710756 + 40947201 = 207766^2 + 6399^2 .

It is a cyclic number.

It is not a de Polignac number, because 43207657957 - 2³ = 43207657949 is a prime.

It is a super-2 number, since 2×43207657957² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43207657898 and 43207657907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43207657951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21603828978 + 21603828979.

It is an arithmetic number, because the mean of its divisors is an integer number (21603828979).

Almost surely, 2^43207657957 is an apocalyptic number.

It is an amenable number.

43207657957 is a deficient number, since it is larger than the sum of its proper divisors (1).

43207657957 is an equidigital number, since it uses as much as digits as its factorization.

43207657957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11113200, while the sum is 55.

The spelling of 43207657957 in words is "forty-three billion, two hundred seven million, six hundred fifty-seven thousand, nine hundred fifty-seven".