6442521677 has 8 divisors (see below), whose sum is σ = 6473161056. Its totient is φ = 6411935952.

The previous prime is 6442521647. The next prime is 6442521707. The reversal of 6442521677 is 7761252446.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6442521647) and next prime (6442521707).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6442521677 - 2¹² = 6442517581 is a prime.

It is a super-2 number, since 2×6442521677² = 83012171117229784658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6442521607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238418 + ... + 264060.

It is an arithmetic number, because the mean of its divisors is an integer number (809145132).

Almost surely, 2^6442521677 is an apocalyptic number.

It is an amenable number.

6442521677 is a deficient number, since it is larger than the sum of its proper divisors (30639379).

6442521677 is a wasteful number, since it uses less digits than its factorization.

6442521677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26827.

The product of its digits is 564480, while the sum is 44.

The square root of 6442521677 is about 80265.3205126598. The cubic root of 6442521677 is about 1860.7382968203.

The spelling of 6442521677 in words is "six billion, four hundred forty-two million, five hundred twenty-one thousand, six hundred seventy-seven".