40001709857 has 2 divisors, whose sum is σ = 40001709858. Its totient is φ = 40001709856.

The previous prime is 40001709827. The next prime is 40001709887. The reversal of 40001709857 is 75890710004.

It is a balanced prime because it is at equal distance from previous prime (40001709827) and next prime (40001709887).

It can be written as a sum of positive squares in only one way, i.e., 39980402401 + 21307456 = 199951^2 + 4616^2 .

It is a cyclic number.

It is not a de Polignac number, because 40001709857 - 2¹⁸ = 40001447713 is a prime.

It is a super-2 number, since 2×40001709857² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40001709827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20000854928 + 20000854929.

It is an arithmetic number, because the mean of its divisors is an integer number (20000854929).

Almost surely, 2^40001709857 is an apocalyptic number.

It is an amenable number.

40001709857 is a deficient number, since it is larger than the sum of its proper divisors (1).

40001709857 is an equidigital number, since it uses as much as digits as its factorization.

40001709857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 41.

The spelling of 40001709857 in words is "forty billion, one million, seven hundred nine thousand, eight hundred fifty-seven".