166434999501 has 4 divisors (see below), whose sum is σ = 221913332672. Its totient is φ = 110956666332.

The previous prime is 166434999499. The next prime is 166434999503. The reversal of 166434999501 is 105999434661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (166434999499) and next prime (166434999503).

It is not a de Polignac number, because 166434999501 - 2¹ = 166434999499 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 (166434999503) 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, 27739166581 + ... + 27739166586.

It is an arithmetic number, because the mean of its divisors is an integer number (55478333168).

Almost surely, 2^166434999501 is an apocalyptic number.

It is an amenable number.

166434999501 is a deficient number, since it is larger than the sum of its proper divisors (55478333171).

166434999501 is an equidigital number, since it uses as much as digits as its factorization.

166434999501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55478333170.

The product of its (nonzero) digits is 6298560, while the sum is 57.

The spelling of 166434999501 in words is "one hundred sixty-six billion, four hundred thirty-four million, nine hundred ninety-nine thousand, five hundred one".