165647220407 has 2 divisors, whose sum is σ = 165647220408. Its totient is φ = 165647220406.

The previous prime is 165647220373. The next prime is 165647220433. The reversal of 165647220407 is 704022746561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165647220407 - 2¹² = 165647216311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165647220437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82823610203 + 82823610204.

It is an arithmetic number, because the mean of its divisors is an integer number (82823610204).

Almost surely, 2^165647220407 is an apocalyptic number.

165647220407 is a deficient number, since it is larger than the sum of its proper divisors (1).

165647220407 is an equidigital number, since it uses as much as digits as its factorization.

165647220407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 44.

Adding to 165647220407 its reverse (704022746561), we get a palindrome (869669966968).

The spelling of 165647220407 in words is "one hundred sixty-five billion, six hundred forty-seven million, two hundred twenty thousand, four hundred seven".