165525601457 has 2 divisors, whose sum is σ = 165525601458. Its totient is φ = 165525601456.

The previous prime is 165525601447. The next prime is 165525601519. The reversal of 165525601457 is 754106525561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133616567296 + 31909034161 = 365536^2 + 178631^2 .

It is an emirp because it is prime and its reverse (754106525561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165525601457 - 2⁶ = 165525601393 is a prime.

It is not a weakly prime, because it can be changed into another prime (165525601447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82762800728 + 82762800729.

It is an arithmetic number, because the mean of its divisors is an integer number (82762800729).

Almost surely, 2^165525601457 is an apocalyptic number.

It is an amenable number.

165525601457 is a deficient number, since it is larger than the sum of its proper divisors (1).

165525601457 is an equidigital number, since it uses as much as digits as its factorization.

165525601457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260000, while the sum is 47.

The spelling of 165525601457 in words is "one hundred sixty-five billion, five hundred twenty-five million, six hundred one thousand, four hundred fifty-seven".