785505481997 has 2 divisors, whose sum is σ = 785505481998. Its totient is φ = 785505481996.

The previous prime is 785505481987. The next prime is 785505482017. The reversal of 785505481997 is 799184505587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 687098419396 + 98407062601 = 828914^2 + 313699^2 .

It is a cyclic number.

It is not a de Polignac number, because 785505481997 - 2⁶ = 785505481933 is a prime.

It is a super-2 number, since 2×785505481997² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (785505481907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392752740998 + 392752740999.

It is an arithmetic number, because the mean of its divisors is an integer number (392752740999).

Almost surely, 2^785505481997 is an apocalyptic number.

It is an amenable number.

785505481997 is a deficient number, since it is larger than the sum of its proper divisors (1).

785505481997 is an equidigital number, since it uses as much as digits as its factorization.

785505481997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008000, while the sum is 68.

The spelling of 785505481997 in words is "seven hundred eighty-five billion, five hundred five million, four hundred eighty-one thousand, nine hundred ninety-seven".