1787216049497 has 2 divisors, whose sum is σ = 1787216049498. Its totient is φ = 1787216049496.

The previous prime is 1787216049407. The next prime is 1787216049583. The reversal of 1787216049497 is 7949406127871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1016031744256 + 771184305241 = 1007984^2 + 878171^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1787216049497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1787216049407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 893608024748 + 893608024749.

It is an arithmetic number, because the mean of its divisors is an integer number (893608024749).

Almost surely, 2^{1787216049497} is an apocalyptic number.

It is an amenable number.

1787216049497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1787216049497 is an equidigital number, since it uses as much as digits as its factorization.

1787216049497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42674688, while the sum is 65.

The spelling of 1787216049497 in words is "one trillion, seven hundred eighty-seven billion, two hundred sixteen million, forty-nine thousand, four hundred ninety-seven".