6642972551 has 8 divisors (see below), whose sum is σ = 6908025600. Its totient is φ = 6380318560.

The previous prime is 6642972533. The next prime is 6642972601. The reversal of 6642972551 is 1552792466.

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 6642972551 - 2⁶ = 6642972487 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6642972496 and 6642972505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642972521) 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, 594116 + ... + 605193.

It is an arithmetic number, because the mean of its divisors is an integer number (863503200).

Almost surely, 2^6642972551 is an apocalyptic number.

6642972551 is a deficient number, since it is larger than the sum of its proper divisors (265053049).

6642972551 is a wasteful number, since it uses less digits than its factorization.

6642972551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199529.

The product of its digits is 907200, while the sum is 47.

The square root of 6642972551 is about 81504.4327076755. The cubic root of 6642972551 is about 1879.8397093420.

The spelling of 6642972551 in words is "six billion, six hundred forty-two million, nine hundred seventy-two thousand, five hundred fifty-one".