165778594340 has 24 divisors (see below), whose sum is σ = 368613581112. Its totient is φ = 62410764800.

The previous prime is 165778594339. The next prime is 165778594349. The reversal of 165778594340 is 43495877561.

It can be written as a sum of positive squares in 4 ways, for example, as 16502999296 + 149275595044 = 128464^2 + 386362^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 165778594340.

It is not an unprimeable number, because it can be changed into a prime (165778594349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243791711 + ... + 243792390.

It is an arithmetic number, because the mean of its divisors is an integer number (15358899213).

Almost surely, 2^165778594340 is an apocalyptic number.

165778594340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165778594340 is an abundant number, since it is smaller than the sum of its proper divisors (202834986772).

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

165778594340 is a wasteful number, since it uses less digits than its factorization.

165778594340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487584127 (or 487584125 counting only the distinct ones).

The product of its (nonzero) digits is 25401600, while the sum is 59.

The spelling of 165778594340 in words is "one hundred sixty-five billion, seven hundred seventy-eight million, five hundred ninety-four thousand, three hundred forty".