7920205761 has 8 divisors (see below), whose sum is σ = 11372603200. Its totient is φ = 4873972752.

The previous prime is 7920205723. The next prime is 7920205763. The reversal of 7920205761 is 1675020297.

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

It is not a de Polignac number, because 7920205761 - 2¹⁸ = 7919943617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 203082199 = 7920205761 / (7 + 9 + 2 + 0 + 2 + 0 + 5 + 7 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7920205763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101541061 + ... + 101541138.

It is an arithmetic number, because the mean of its divisors is an integer number (1421575400).

Almost surely, 2^7920205761 is an apocalyptic number.

It is an amenable number.

7920205761 is a deficient number, since it is larger than the sum of its proper divisors (3452397439).

7920205761 is a wasteful number, since it uses less digits than its factorization.

7920205761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203082215.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 7920205761 is about 88995.5378712888. The cubic root of 7920205761 is about 1993.3282486985.

The spelling of 7920205761 in words is "seven billion, nine hundred twenty million, two hundred five thousand, seven hundred sixty-one".