7858021663537 has 2 divisors, whose sum is σ = 7858021663538. Its totient is φ = 7858021663536.

The previous prime is 7858021663487. The next prime is 7858021663543. The reversal of 7858021663537 is 7353661208587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5638767902881 + 2219253760656 = 2374609^2 + 1489716^2 .

It is a cyclic number.

It is not a de Polignac number, because 7858021663537 - 2¹⁵ = 7858021630769 is a prime.

It is not a weakly prime, because it can be changed into another prime (7858021663567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3929010831768 + 3929010831769.

It is an arithmetic number, because the mean of its divisors is an integer number (3929010831769).

Almost surely, 2^{7858021663537} is an apocalyptic number.

It is an amenable number.

7858021663537 is a deficient number, since it is larger than the sum of its proper divisors (1).

7858021663537 is an equidigital number, since it uses as much as digits as its factorization.

7858021663537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50803200, while the sum is 61.

The spelling of 7858021663537 in words is "seven trillion, eight hundred fifty-eight billion, twenty-one million, six hundred sixty-three thousand, five hundred thirty-seven".