161587982797 has 2 divisors, whose sum is σ = 161587982798. Its totient is φ = 161587982796.

The previous prime is 161587982729. The next prime is 161587982839. The reversal of 161587982797 is 797289785161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105586653481 + 56001329316 = 324941^2 + 236646^2 .

It is a cyclic number.

It is not a de Polignac number, because 161587982797 - 2³¹ = 159440499149 is a prime.

It is a super-2 number, since 2×161587982797² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161587982707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80793991398 + 80793991399.

It is an arithmetic number, because the mean of its divisors is an integer number (80793991399).

Almost surely, 2^161587982797 is an apocalyptic number.

It is an amenable number.

161587982797 is a deficient number, since it is larger than the sum of its proper divisors (1).

161587982797 is an equidigital number, since it uses as much as digits as its factorization.

161587982797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 106686720, while the sum is 70.

The spelling of 161587982797 in words is "one hundred sixty-one billion, five hundred eighty-seven million, nine hundred eighty-two thousand, seven hundred ninety-seven".