7661538671 has 4 divisors (see below), whose sum is σ = 7994649072. Its totient is φ = 7328428272.

The previous prime is 7661538629. The next prime is 7661538691. The reversal of 7661538671 is 1768351667.

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 7661538671 - 2¹⁰ = 7661537647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7661538691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166555166 + ... + 166555211.

It is an arithmetic number, because the mean of its divisors is an integer number (1998662268).

Almost surely, 2^7661538671 is an apocalyptic number.

7661538671 is a deficient number, since it is larger than the sum of its proper divisors (333110401).

7661538671 is a wasteful number, since it uses less digits than its factorization.

7661538671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333110400.

The product of its digits is 1270080, while the sum is 50.

The square root of 7661538671 is about 87530.2157600448. The cubic root of 7661538671 is about 1971.3875038086.

The spelling of 7661538671 in words is "seven billion, six hundred sixty-one million, five hundred thirty-eight thousand, six hundred seventy-one".