7800521479 has 2 divisors, whose sum is σ = 7800521480. Its totient is φ = 7800521478.

The previous prime is 7800521467. The next prime is 7800521549. The reversal of 7800521479 is 9741250087.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7800521479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7800522479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3900260739 + 3900260740.

It is an arithmetic number, because the mean of its divisors is an integer number (3900260740).

Almost surely, 2^7800521479 is an apocalyptic number.

7800521479 is a deficient number, since it is larger than the sum of its proper divisors (1).

7800521479 is an equidigital number, since it uses as much as digits as its factorization.

7800521479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 43.

The square root of 7800521479 is about 88320.5609074127. The cubic root of 7800521479 is about 1983.2366779879.

The spelling of 7800521479 in words is "seven billion, eight hundred million, five hundred twenty-one thousand, four hundred seventy-nine".