6469752781 has 16 divisors (see below), whose sum is σ = 7124597568. Its totient is φ = 5850028800.

The previous prime is 6469752749. The next prime is 6469752787. The reversal of 6469752781 is 1872579646.

It is a cyclic number.

It is not a de Polignac number, because 6469752781 - 2⁵ = 6469752749 is a prime.

It is a super-2 number, since 2×6469752781² = 83715402094514467922, 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 (6469752787) 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, 27955 + ... + 117136.

It is an arithmetic number, because the mean of its divisors is an integer number (445287348).

Almost surely, 2^6469752781 is an apocalyptic number.

6469752781 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6469752781 is a deficient number, since it is larger than the sum of its proper divisors (654844787).

6469752781 is a wasteful number, since it uses less digits than its factorization.

6469752781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145212.

The product of its digits is 5080320, while the sum is 55.

The square root of 6469752781 is about 80434.7734565095. The cubic root of 6469752781 is about 1863.3562538654.

The spelling of 6469752781 in words is "six billion, four hundred sixty-nine million, seven hundred fifty-two thousand, seven hundred eighty-one".