7664615645 has 8 divisors (see below), whose sum is σ = 9421869240. Its totient is φ = 5982138880.

The previous prime is 7664615587. The next prime is 7664615659. The reversal of 7664615645 is 5465164667.

It can be written as a sum of positive squares in 4 ways, for example, as 1215080164 + 6449535481 = 34858^2 + 80309^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7664615645 - 2¹⁰ = 7664614621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7664615593 and 7664615602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18693980 + ... + 18694389.

It is an arithmetic number, because the mean of its divisors is an integer number (1177733655).

Almost surely, 2^7664615645 is an apocalyptic number.

It is an amenable number.

7664615645 is a deficient number, since it is larger than the sum of its proper divisors (1757253595).

7664615645 is a wasteful number, since it uses less digits than its factorization.

7664615645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37388415.

The product of its digits is 3628800, while the sum is 50.

The square root of 7664615645 is about 87547.7906346014. The cubic root of 7664615645 is about 1971.6513801432.

The spelling of 7664615645 in words is "seven billion, six hundred sixty-four million, six hundred fifteen thousand, six hundred forty-five".