7540905857 has 2 divisors, whose sum is σ = 7540905858. Its totient is φ = 7540905856.

The previous prime is 7540905851. The next prime is 7540905881. The reversal of 7540905857 is 7585090457.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7449588721 + 91317136 = 86311^2 + 9556^2 .

It is a cyclic number.

It is not a de Polignac number, because 7540905857 - 2⁸ = 7540905601 is a prime.

It is a super-2 number, since 2×7540905857² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7540905851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3770452928 + 3770452929.

It is an arithmetic number, because the mean of its divisors is an integer number (3770452929).

Almost surely, 2^7540905857 is an apocalyptic number.

It is an amenable number.

7540905857 is a deficient number, since it is larger than the sum of its proper divisors (1).

7540905857 is an equidigital number, since it uses as much as digits as its factorization.

7540905857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764000, while the sum is 50.

The square root of 7540905857 is about 86838.3893045006. The cubic root of 7540905857 is about 1960.9860595272.

The spelling of 7540905857 in words is "seven billion, five hundred forty million, nine hundred five thousand, eight hundred fifty-seven".