7664447551 has 4 divisors (see below), whose sum is σ = 7665070672. Its totient is φ = 7663824432.

The previous prime is 7664447543. The next prime is 7664447579. The reversal of 7664447551 is 1557444667.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7664447551 - 2³ = 7664447543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7664447495 and 7664447504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7664447051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292731 + ... + 317836.

It is an arithmetic number, because the mean of its divisors is an integer number (1916267668).

Almost surely, 2^7664447551 is an apocalyptic number.

7664447551 is a deficient number, since it is larger than the sum of its proper divisors (623121).

7664447551 is a wasteful number, since it uses less digits than its factorization.

7664447551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623120.

The product of its digits is 2822400, while the sum is 49.

The square root of 7664447551 is about 87546.8306165335. The cubic root of 7664447551 is about 1971.6369664963.

The spelling of 7664447551 in words is "seven billion, six hundred sixty-four million, four hundred forty-seven thousand, five hundred fifty-one".