165421158377 has 2 divisors, whose sum is σ = 165421158378. Its totient is φ = 165421158376.

The previous prime is 165421158367. The next prime is 165421158437. The reversal of 165421158377 is 773851124561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107617458601 + 57803699776 = 328051^2 + 240424^2 .

It is a cyclic number.

It is not a de Polignac number, because 165421158377 - 2⁴ = 165421158361 is a prime.

It is not a weakly prime, because it can be changed into another prime (165421158367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82710579188 + 82710579189.

It is an arithmetic number, because the mean of its divisors is an integer number (82710579189).

Almost surely, 2^165421158377 is an apocalyptic number.

It is an amenable number.

165421158377 is a deficient number, since it is larger than the sum of its proper divisors (1).

165421158377 is an equidigital number, since it uses as much as digits as its factorization.

165421158377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1411200, while the sum is 50.

The spelling of 165421158377 in words is "one hundred sixty-five billion, four hundred twenty-one million, one hundred fifty-eight thousand, three hundred seventy-seven".