164651603553540 has 120 divisors (see below), whose sum is σ = 516681288490752. Its totient is φ = 43893228974400.

The previous prime is 164651603553529. The next prime is 164651603553629. The reversal of 164651603553540 is 45355306156461.

164651603553540 is a `hidden beast` number, since 1 + 6 + 4 + 6 + 5 + 1 + 60 + 3 + 5 + 535 + 40 = 666.

It is a super-2 number, since 2×164651603553540² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10915686 + ... + 21176765.

Almost surely, 2^{164651603553540} is an apocalyptic number.

164651603553540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164651603553540 is an abundant number, since it is smaller than the sum of its proper divisors (352029684937212).

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

164651603553540 is a wasteful number, since it uses less digits than its factorization.

164651603553540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32095639 (or 32095628 counting only the distinct ones).

The product of its (nonzero) digits is 19440000, while the sum is 54.

The spelling of 164651603553540 in words is "one hundred sixty-four trillion, six hundred fifty-one billion, six hundred three million, five hundred fifty-three thousand, five hundred forty".