166402527503 has 4 divisors (see below), whose sum is σ = 170272353768. Its totient is φ = 162532701240.

The previous prime is 166402527491. The next prime is 166402527509. The reversal of 166402527503 is 305725204661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166402527503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166402527509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1934913068 + ... + 1934913153.

It is an arithmetic number, because the mean of its divisors is an integer number (42568088442).

Almost surely, 2^166402527503 is an apocalyptic number.

166402527503 is a deficient number, since it is larger than the sum of its proper divisors (3869826265).

166402527503 is an equidigital number, since it uses as much as digits as its factorization.

166402527503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3869826264.

The product of its (nonzero) digits is 302400, while the sum is 41.

The spelling of 166402527503 in words is "one hundred sixty-six billion, four hundred two million, five hundred twenty-seven thousand, five hundred three".