165663001563440 has 40 divisors (see below), whose sum is σ = 385170316481808. Its totient is φ = 66264540350720.

The previous prime is 165663001563391. The next prime is 165663001563457. The reversal of 165663001563440 is 44365100366561.

It is a tau number, because it is divible by the number of its divisors (40).

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, 2198126 + ... + 18334605.

Almost surely, 2^{165663001563440} is an apocalyptic number.

165663001563440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165663001563440 is an abundant number, since it is smaller than the sum of its proper divisors (219507314918368).

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

165663001563440 is a wasteful number, since it uses less digits than its factorization.

165663001563440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20633597 (or 20633591 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 50.

The spelling of 165663001563440 in words is "one hundred sixty-five trillion, six hundred sixty-three billion, one million, five hundred sixty-three thousand, four hundred forty".