7761660257 has 8 divisors (see below), whose sum is σ = 8459419584. Its totient is φ = 7078287888.

The previous prime is 7761660251. The next prime is 7761660271. The reversal of 7761660257 is 7520661677.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7761660257 - 2⁴ = 7761660241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7761660251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3595613 + ... + 3597770.

It is an arithmetic number, because the mean of its divisors is an integer number (1057427448).

Almost surely, 2^7761660257 is an apocalyptic number.

It is an amenable number.

7761660257 is a deficient number, since it is larger than the sum of its proper divisors (697759327).

7761660257 is a wasteful number, since it uses less digits than its factorization.

7761660257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7193479.

The product of its (nonzero) digits is 740880, while the sum is 47.

The square root of 7761660257 is about 88100.2852265530. The cubic root of 7761660257 is about 1979.9377813493.

The spelling of 7761660257 in words is "seven billion, seven hundred sixty-one million, six hundred sixty thousand, two hundred fifty-seven".