4020915557 has 2 divisors, whose sum is σ = 4020915558. Its totient is φ = 4020915556.

The previous prime is 4020915449. The next prime is 4020915601. The reversal of 4020915557 is 7555190204.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3381887716 + 639027841 = 58154^2 + 25279^2 .

It is a cyclic number.

It is not a de Polignac number, because 4020915557 - 2²⁶ = 3953806693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4020915557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4020915257) 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 as a sum of consecutive naturals, namely, 2010457778 + 2010457779.

It is an arithmetic number, because the mean of its divisors is an integer number (2010457779).

Almost surely, 2^4020915557 is an apocalyptic number.

It is an amenable number.

4020915557 is a deficient number, since it is larger than the sum of its proper divisors (1).

4020915557 is an equidigital number, since it uses as much as digits as its factorization.

4020915557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63000, while the sum is 38.

The square root of 4020915557 is about 63410.6896114527. The cubic root of 4020915557 is about 1590.1630249625.

The spelling of 4020915557 in words is "four billion, twenty million, nine hundred fifteen thousand, five hundred fifty-seven".