7665713421 has 4 divisors (see below), whose sum is σ = 10220951232. Its totient is φ = 5110475612.

The previous prime is 7665713351. The next prime is 7665713437. The reversal of 7665713421 is 1243175667.

It is a happy number.

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 7665713421 - 2⁹ = 7665712909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7665713221) 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, 1277618901 + ... + 1277618906.

It is an arithmetic number, because the mean of its divisors is an integer number (2555237808).

Almost surely, 2^7665713421 is an apocalyptic number.

It is an amenable number.

7665713421 is a deficient number, since it is larger than the sum of its proper divisors (2555237811).

7665713421 is a wasteful number, since it uses less digits than its factorization.

7665713421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2555237810.

The product of its digits is 211680, while the sum is 42.

The square root of 7665713421 is about 87554.0599915275. The cubic root of 7665713421 is about 1971.7455065521.

The spelling of 7665713421 in words is "seven billion, six hundred sixty-five million, seven hundred thirteen thousand, four hundred twenty-one".