8021561258 has 16 divisors (see below), whose sum is σ = 12156275040. Its totient is φ = 3969680400.

The previous prime is 8021561243. The next prime is 8021561263. The reversal of 8021561258 is 8521651208.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23873 + ... + 128891.

It is an arithmetic number, because the mean of its divisors is an integer number (759767190).

Almost surely, 2^8021561258 is an apocalyptic number.

8021561258 is a deficient number, since it is larger than the sum of its proper divisors (4134713782).

8021561258 is a wasteful number, since it uses less digits than its factorization.

8021561258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105413.

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 8021561258 is about 89563.1690931043. The cubic root of 8021561258 is about 2001.7951597187.

The spelling of 8021561258 in words is "eight billion, twenty-one million, five hundred sixty-one thousand, two hundred fifty-eight".