165660156640 has 48 divisors (see below), whose sum is σ = 426951408240. Its totient is φ = 60240056320.

The previous prime is 165660156637. The next prime is 165660156643. The reversal of 165660156640 is 46651066561.

It is an interprime number because it is at equal distance from previous prime (165660156637) and next prime (165660156643).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165660156643) 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, 47060785 + ... + 47064304.

It is an arithmetic number, because the mean of its divisors is an integer number (8894821005).

Almost surely, 2^165660156640 is an apocalyptic number.

165660156640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165660156640 is an abundant number, since it is smaller than the sum of its proper divisors (261291251600).

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

165660156640 is a wasteful number, since it uses less digits than its factorization.

165660156640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94125115 (or 94125107 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 165660156640 in words is "one hundred sixty-five billion, six hundred sixty million, one hundred fifty-six thousand, six hundred forty".