165490021390 has 16 divisors (see below), whose sum is σ = 299394133632. Its totient is φ = 65859987424.

The previous prime is 165490021381. The next prime is 165490021391. The reversal of 165490021390 is 93120094561.

165490021390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165490021391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42000574 + ... + 42004513.

It is an arithmetic number, because the mean of its divisors is an integer number (18712133352).

Almost surely, 2^165490021390 is an apocalyptic number.

165490021390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165490021390 is a deficient number, since it is larger than the sum of its proper divisors (133904112242).

165490021390 is a wasteful number, since it uses less digits than its factorization.

165490021390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84005291.

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 165490021390 in words is "one hundred sixty-five billion, four hundred ninety million, twenty-one thousand, three hundred ninety".