7662747661 has 4 divisors (see below), whose sum is σ = 7792624800. Its totient is φ = 7532870524.

The previous prime is 7662747641. The next prime is 7662747793. The reversal of 7662747661 is 1667472667.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7662747661 - 2⁵ = 7662747629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7662747599 and 7662747608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7662747611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64938481 + ... + 64938598.

It is an arithmetic number, because the mean of its divisors is an integer number (1948156200).

Almost surely, 2^7662747661 is an apocalyptic number.

It is an amenable number.

7662747661 is a deficient number, since it is larger than the sum of its proper divisors (129877139).

7662747661 is a wasteful number, since it uses less digits than its factorization.

7662747661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129877138.

The product of its digits is 3556224, while the sum is 52.

The square root of 7662747661 is about 87537.1216170603. The cubic root of 7662747661 is about 1971.4911932687.

The spelling of 7662747661 in words is "seven billion, six hundred sixty-two million, seven hundred forty-seven thousand, six hundred sixty-one".