165431737680 has 160 divisors (see below), whose sum is σ = 560157147648. Its totient is φ = 40054694400.

The previous prime is 165431737637. The next prime is 165431737693. The reversal of 165431737680 is 86737134561.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2102407 + ... + 2179673.

Almost surely, 2^165431737680 is an apocalyptic number.

165431737680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165431737680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280078573824).

165431737680 is an abundant number, since it is smaller than the sum of its proper divisors (394725409968).

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

165431737680 is a wasteful number, since it uses less digits than its factorization.

165431737680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78105 (or 78099 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 51.

The spelling of 165431737680 in words is "one hundred sixty-five billion, four hundred thirty-one million, seven hundred thirty-seven thousand, six hundred eighty".