7858021663536 has 160 divisors (see below), whose sum is σ = 22619098285056. Its totient is φ = 2330287872000.

The previous prime is 7858021663487. The next prime is 7858021663537. The reversal of 7858021663536 is 6353661208587.

It is a self number, because there is not a number n which added to its sum of digits gives 7858021663536.

It is not an unprimeable number, because it can be changed into a prime (7858021663537) 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 31 ways as a sum of consecutive naturals, for example, 365801916 + ... + 365823396.

Almost surely, 2^{7858021663536} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7858021663536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11309549142528).

7858021663536 is an abundant number, since it is smaller than the sum of its proper divisors (14761076621520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7858021663536 is a wasteful number, since it uses less digits than its factorization.

7858021663536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36291 (or 36285 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 60.

The spelling of 7858021663536 in words is "seven trillion, eight hundred fifty-eight billion, twenty-one million, six hundred sixty-three thousand, five hundred thirty-six".