6845720146 has 4 divisors (see below), whose sum is σ = 10268580222. Its totient is φ = 3422860072.

The previous prime is 6845720117. The next prime is 6845720149. The reversal of 6845720146 is 6410275486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6410275486 = 2 ⋅3205137743.

It can be written as a sum of positive squares in only one way, i.e., 4714882225 + 2130837921 = 68665^2 + 46161^2 .

It is a super-2 number, since 2×6845720146² = 93727768634700522632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6845720149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1711430035 + ... + 1711430038.

Almost surely, 2^6845720146 is an apocalyptic number.

6845720146 is a deficient number, since it is larger than the sum of its proper divisors (3422860076).

6845720146 is a wasteful number, since it uses less digits than its factorization.

6845720146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3422860075.

The product of its (nonzero) digits is 322560, while the sum is 43.

The square root of 6845720146 is about 82738.8672027844. The cubic root of 6845720146 is about 1898.7729978118.

The spelling of 6845720146 in words is "six billion, eight hundred forty-five million, seven hundred twenty thousand, one hundred forty-six".