6642451 has 4 divisors (see below), whose sum is σ = 6804504. Its totient is φ = 6480400.

The previous prime is 6642439. The next prime is 6642487. The reversal of 6642451 is 1542466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1542466 = 2 ⋅771233.

It is a cyclic number.

It is not a de Polignac number, because 6642451 - 2¹⁹ = 6118163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6642431) 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, 80965 + ... + 81046.

It is an arithmetic number, because the mean of its divisors is an integer number (1701126).

Almost surely, 2^6642451 is an apocalyptic number.

6642451 is a deficient number, since it is larger than the sum of its proper divisors (162053).

6642451 is a wasteful number, since it uses less digits than its factorization.

6642451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162052.

The product of its digits is 5760, while the sum is 28.

The square root of 6642451 is about 2577.2952876999. The cubic root of 6642451 is about 187.9790511590.

The spelling of 6642451 in words is "six million, six hundred forty-two thousand, four hundred fifty-one".