165707421013 has 2 divisors, whose sum is σ = 165707421014. Its totient is φ = 165707421012.

The previous prime is 165707420999. The next prime is 165707421041. The reversal of 165707421013 is 310124707561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84691476324 + 81015944689 = 291018^2 + 284633^2 .

It is a cyclic number.

It is not a de Polignac number, because 165707421013 - 2¹³ = 165707412821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165707421043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82853710506 + 82853710507.

It is an arithmetic number, because the mean of its divisors is an integer number (82853710507).

Almost surely, 2^165707421013 is an apocalyptic number.

It is an amenable number.

165707421013 is a deficient number, since it is larger than the sum of its proper divisors (1).

165707421013 is an equidigital number, since it uses as much as digits as its factorization.

165707421013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 165707421013 in words is "one hundred sixty-five billion, seven hundred seven million, four hundred twenty-one thousand, thirteen".