166581003603630 has 128 divisors (see below), whose sum is σ = 500949727027200. Its totient is φ = 34440293543040.

The previous prime is 166581003603583. The next prime is 166581003603683. The reversal of 166581003603630 is 36306300185661.

It is a happy number.

166581003603630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×166581003603630² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166581003603630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 180728724 + ... + 181648103.

It is an arithmetic number, because the mean of its divisors is an integer number (3913669742400).

Almost surely, 2^{166581003603630} is an apocalyptic number.

166581003603630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166581003603630 is an abundant number, since it is smaller than the sum of its proper divisors (334368723423570).

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

166581003603630 is a wasteful number, since it uses less digits than its factorization.

166581003603630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362377054.

The product of its (nonzero) digits is 1399680, while the sum is 48.

The spelling of 166581003603630 in words is "one hundred sixty-six trillion, five hundred eighty-one billion, three million, six hundred three thousand, six hundred thirty".