166302621156540 has 144 divisors (see below), whose sum is σ = 511870766561280. Its totient is φ = 40312358486400.

The previous prime is 166302621156527. The next prime is 166302621156559. The reversal of 166302621156540 is 45651126203661.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 166302621156540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 84924981 + ... + 86861139.

It is an arithmetic number, because the mean of its divisors is an integer number (3554658101120).

Almost surely, 2^{166302621156540} is an apocalyptic number.

166302621156540 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 166302621156540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255935383280640).

166302621156540 is an abundant number, since it is smaller than the sum of its proper divisors (345568145404740).

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

166302621156540 is a wasteful number, since it uses less digits than its factorization.

166302621156540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948024 (or 1948011 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 166302621156540 in words is "one hundred sixty-six trillion, three hundred two billion, six hundred twenty-one million, one hundred fifty-six thousand, five hundred forty".