165020077770 has 32 divisors (see below), whose sum is σ = 413267674752. Its totient is φ = 42092077632.

The previous prime is 165020077763. The next prime is 165020077771. The reversal of 165020077770 is 77770020561.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165020077771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119579077 + ... + 119580456.

It is an arithmetic number, because the mean of its divisors is an integer number (12914614836).

Almost surely, 2^165020077770 is an apocalyptic number.

165020077770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165020077770 is an abundant number, since it is smaller than the sum of its proper divisors (248247596982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165020077770 is a wasteful number, since it uses less digits than its factorization.

165020077770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239159566.

The product of its (nonzero) digits is 144060, while the sum is 42.

The spelling of 165020077770 in words is "one hundred sixty-five billion, twenty million, seventy-seven thousand, seven hundred seventy".