40447742971 has 2 divisors, whose sum is σ = 40447742972. Its totient is φ = 40447742970.

The previous prime is 40447742969. The next prime is 40447743043. The reversal of 40447742971 is 17924774404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40447742971 - 2¹ = 40447742969 is a prime.

It is a super-2 number, since 2×40447742971² (a number of 22 digits) contains 22 as substring.

Together with 40447742969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40447742921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20223871485 + 20223871486.

It is an arithmetic number, because the mean of its divisors is an integer number (20223871486).

Almost surely, 2^40447742971 is an apocalyptic number.

40447742971 is a deficient number, since it is larger than the sum of its proper divisors (1).

40447742971 is an equidigital number, since it uses as much as digits as its factorization.

40447742971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1580544, while the sum is 49.

The spelling of 40447742971 in words is "forty billion, four hundred forty-seven million, seven hundred forty-two thousand, nine hundred seventy-one".