165710721070 has 16 divisors (see below), whose sum is σ = 298352496960. Its totient is φ = 66268021984.

The previous prime is 165710721067. The next prime is 165710721083. The reversal of 165710721070 is 70127017561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1990477 + ... + 2072056.

It is an arithmetic number, because the mean of its divisors is an integer number (18647031060).

Almost surely, 2^165710721070 is an apocalyptic number.

165710721070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165710721070 is a deficient number, since it is larger than the sum of its proper divisors (132641775890).

165710721070 is a wasteful number, since it uses less digits than its factorization.

165710721070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4066619.

The product of its (nonzero) digits is 20580, while the sum is 37.

The spelling of 165710721070 in words is "one hundred sixty-five billion, seven hundred ten million, seven hundred twenty-one thousand, seventy".