245645431639 has 2 divisors, whose sum is σ = 245645431640. Its totient is φ = 245645431638.

The previous prime is 245645431589. The next prime is 245645431643. The reversal of 245645431639 is 936134546542.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 245645431639 - 2¹¹ = 245645429591 is a prime.

It is a super-2 number, since 2×245645431639² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245645431739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122822715819 + 122822715820.

It is an arithmetic number, because the mean of its divisors is an integer number (122822715820).

Almost surely, 2^245645431639 is an apocalyptic number.

245645431639 is a deficient number, since it is larger than the sum of its proper divisors (1).

245645431639 is an equidigital number, since it uses as much as digits as its factorization.

245645431639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9331200, while the sum is 52.

The spelling of 245645431639 in words is "two hundred forty-five billion, six hundred forty-five million, four hundred thirty-one thousand, six hundred thirty-nine".