7671117661 has 4 divisors (see below), whose sum is σ = 7739003772. Its totient is φ = 7603231552.

The previous prime is 7671117659. The next prime is 7671117697. The reversal of 7671117661 is 1667111767.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2936989636 + 4734128025 = 54194^2 + 68805^2 .

It is a cyclic number.

It is not a de Polignac number, because 7671117661 - 2¹ = 7671117659 is a prime.

It is a super-2 number, since 2×7671117661² (a number of 21 digits) 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 (7671118661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33942886 + ... + 33943111.

It is an arithmetic number, because the mean of its divisors is an integer number (1934750943).

Almost surely, 2^7671117661 is an apocalyptic number.

It is an amenable number.

7671117661 is a deficient number, since it is larger than the sum of its proper divisors (67886111).

7671117661 is a wasteful number, since it uses less digits than its factorization.

7671117661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67886110.

The product of its digits is 74088, while the sum is 43.

The square root of 7671117661 is about 87584.9168578700. The cubic root of 7671117661 is about 1972.2087503610.

It can be divided in two parts, 767111766 and 1, that added together give a palindrome (767111767).

The spelling of 7671117661 in words is "seven billion, six hundred seventy-one million, one hundred seventeen thousand, six hundred sixty-one".