6445121534 has 16 divisors (see below), whose sum is σ = 9701596368. Its totient is φ = 3211276992.

The previous prime is 6445121519. The next prime is 6445121539. The reversal of 6445121534 is 4351215446.

It is a junction number, because it is equal to n+sod(n) for n = 6445121494 and 6445121503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445121539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690104 + ... + 699380.

It is an arithmetic number, because the mean of its divisors is an integer number (606349773).

Almost surely, 2^6445121534 is an apocalyptic number.

6445121534 is a deficient number, since it is larger than the sum of its proper divisors (3256474834).

6445121534 is a wasteful number, since it uses less digits than its factorization.

6445121534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10459.

The product of its digits is 57600, while the sum is 35.

The square root of 6445121534 is about 80281.5142732124. The cubic root of 6445121534 is about 1860.9885612942.

The spelling of 6445121534 in words is "six billion, four hundred forty-five million, one hundred twenty-one thousand, five hundred thirty-four".