6645623031 has 6 divisors (see below), whose sum is σ = 9599233280. Its totient is φ = 4430415348.

The previous prime is 6645623029. The next prime is 6645623077. The reversal of 6645623031 is 1303265466.

6645623031 is a `hidden beast` number, since 6 + 64 + 562 + 3 + 0 + 31 = 666.

It is not a de Polignac number, because 6645623031 - 2¹ = 6645623029 is a prime.

It is a super-2 number, since 2×6645623031² = 88328610940315253922, 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 (6645623011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 369201271 + ... + 369201288.

Almost surely, 2^6645623031 is an apocalyptic number.

6645623031 is a deficient number, since it is larger than the sum of its proper divisors (2953610249).

6645623031 is a wasteful number, since it uses less digits than its factorization.

6645623031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738402565 (or 738402562 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 6645623031 is about 81520.6908152771. The cubic root of 6645623031 is about 1880.0896885498.

Adding to 6645623031 its reverse (1303265466), we get a palindrome (7948888497).

The spelling of 6645623031 in words is "six billion, six hundred forty-five million, six hundred twenty-three thousand, thirty-one".