7872166261 has 8 divisors (see below), whose sum is σ = 8162016480. Its totient is φ = 7583542512.

The previous prime is 7872166259. The next prime is 7872166307. The reversal of 7872166261 is 1626612787.

It is a happy number.

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 7872166261 - 2¹ = 7872166259 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 (7872166061) 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, 293535 + ... + 319228.

It is an arithmetic number, because the mean of its divisors is an integer number (1020252060).

Almost surely, 2^7872166261 is an apocalyptic number.

It is an amenable number.

7872166261 is a deficient number, since it is larger than the sum of its proper divisors (289850219).

7872166261 is a wasteful number, since it uses less digits than its factorization.

7872166261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613235.

The product of its digits is 338688, while the sum is 46.

The square root of 7872166261 is about 88725.2289994227. The cubic root of 7872166261 is about 1989.2899380787.

The spelling of 7872166261 in words is "seven billion, eight hundred seventy-two million, one hundred sixty-six thousand, two hundred sixty-one".