7661256585 has 16 divisors (see below), whose sum is σ = 12354533376. Its totient is φ = 4053829248.

The previous prime is 7661256541. The next prime is 7661256587. The reversal of 7661256585 is 5856521667.

It is a happy number.

It is not a de Polignac number, because 7661256585 - 2¹⁰ = 7661255561 is a prime.

It is a super-2 number, since 2×7661256585² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7661256587) 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, 2008924 + ... + 2012733.

It is an arithmetic number, because the mean of its divisors is an integer number (772158336).

Almost surely, 2^7661256585 is an apocalyptic number.

It is an amenable number.

7661256585 is a deficient number, since it is larger than the sum of its proper divisors (4693276791).

7661256585 is a wasteful number, since it uses less digits than its factorization.

7661256585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4021792.

The product of its digits is 3024000, while the sum is 51.

The square root of 7661256585 is about 87528.6043816534. The cubic root of 7661256585 is about 1971.3633090324.

The spelling of 7661256585 in words is "seven billion, six hundred sixty-one million, two hundred fifty-six thousand, five hundred eighty-five".