6638945753 has 16 divisors (see below), whose sum is σ = 7268244480. Its totient is φ = 6013990800.

The previous prime is 6638945707. The next prime is 6638945773. The reversal of 6638945753 is 3575498366.

It is a cyclic number.

It is not a de Polignac number, because 6638945753 - 2¹⁶ = 6638880217 is a prime.

It is a super-2 number, since 2×6638945753² = 88151201422553474018, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6638945773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7484276 + ... + 7485162.

It is an arithmetic number, because the mean of its divisors is an integer number (454265280).

Almost surely, 2^6638945753 is an apocalyptic number.

It is an amenable number.

6638945753 is a deficient number, since it is larger than the sum of its proper divisors (629298727).

6638945753 is a wasteful number, since it uses less digits than its factorization.

6638945753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2548.

The product of its digits is 16329600, while the sum is 56.

The square root of 6638945753 is about 81479.7260243307. The cubic root of 6638945753 is about 1879.4597958437.

The spelling of 6638945753 in words is "six billion, six hundred thirty-eight million, nine hundred forty-five thousand, seven hundred fifty-three".