166640450351 has 4 divisors (see below), whose sum is σ = 166643426400. Its totient is φ = 166637474304.

The previous prime is 166640450299. The next prime is 166640450371. The reversal of 166640450351 is 153054046661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 153054046661 = 91159 ⋅1678979.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166640450351 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166640450299 and 166640450308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166640450371) 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, 1402391 + ... + 1516568.

It is an arithmetic number, because the mean of its divisors is an integer number (41660856600).

Almost surely, 2^166640450351 is an apocalyptic number.

166640450351 is a deficient number, since it is larger than the sum of its proper divisors (2976049).

166640450351 is an equidigital number, since it uses as much as digits as its factorization.

166640450351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2976048.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 166640450351 in words is "one hundred sixty-six billion, six hundred forty million, four hundred fifty thousand, three hundred fifty-one".