7997255555 has 4 divisors (see below), whose sum is σ = 9596706672. Its totient is φ = 6397804440.

The previous prime is 7997255551. The next prime is 7997255561. The reversal of 7997255555 is 5555527997.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 7997255555 - 2² = 7997255551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7997255494 and 7997255503.

It is not an unprimeable number, because it can be changed into a prime (7997255551) 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, 799725551 + ... + 799725560.

It is an arithmetic number, because the mean of its divisors is an integer number (2399176668).

Almost surely, 2^7997255555 is an apocalyptic number.

7997255555 is a deficient number, since it is larger than the sum of its proper divisors (1599451117).

7997255555 is a wasteful number, since it uses less digits than its factorization.

7997255555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1599451116.

The product of its digits is 24806250, while the sum is 59.

The square root of 7997255555 is about 89427.3758700321. The cubic root of 7997255555 is about 1999.7712700923.

The spelling of 7997255555 in words is "seven billion, nine hundred ninety-seven million, two hundred fifty-five thousand, five hundred fifty-five".