42407309657 has 2 divisors, whose sum is σ = 42407309658. Its totient is φ = 42407309656.

The previous prime is 42407309647. The next prime is 42407309669. The reversal of 42407309657 is 75690370424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42378751321 + 28558336 = 205861^2 + 5344^2 .

It is a cyclic number.

It is not a de Polignac number, because 42407309657 - 2⁴ = 42407309641 is a prime.

It is not a weakly prime, because it can be changed into another prime (42407309647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21203654828 + 21203654829.

It is an arithmetic number, because the mean of its divisors is an integer number (21203654829).

Almost surely, 2^42407309657 is an apocalyptic number.

It is an amenable number.

42407309657 is a deficient number, since it is larger than the sum of its proper divisors (1).

42407309657 is an equidigital number, since it uses as much as digits as its factorization.

42407309657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 47.

The spelling of 42407309657 in words is "forty-two billion, four hundred seven million, three hundred nine thousand, six hundred fifty-seven".