8121615442 has 8 divisors (see below), whose sum is σ = 12252842316. Its totient is φ = 4037334672.

The previous prime is 8121615433. The next prime is 8121615473. The reversal of 8121615442 is 2445161218.

It can be written as a sum of positive squares in 2 ways, for example, as 7945761321 + 175854121 = 89139^2 + 13261^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 8121615398 and 8121615407.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11736093 + ... + 11736784.

Almost surely, 2^8121615442 is an apocalyptic number.

8121615442 is a deficient number, since it is larger than the sum of its proper divisors (4131226874).

8121615442 is a wasteful number, since it uses less digits than its factorization.

8121615442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23473052.

The product of its digits is 15360, while the sum is 34.

The square root of 8121615442 is about 90120.0057811805. The cubic root of 8121615442 is about 2010.0836942783.

The spelling of 8121615442 in words is "eight billion, one hundred twenty-one million, six hundred fifteen thousand, four hundred forty-two".