6445581542 has 8 divisors (see below), whose sum is σ = 9674905032. Its totient is φ = 3220613200.

The previous prime is 6445581533. The next prime is 6445581553. The reversal of 6445581542 is 2451855446.

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 = 6445581493 and 6445581502.

It is a congruent number.

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, 1085084 + ... + 1091007.

It is an arithmetic number, because the mean of its divisors is an integer number (1209363129).

Almost surely, 2^6445581542 is an apocalyptic number.

6445581542 is a deficient number, since it is larger than the sum of its proper divisors (3229323490).

6445581542 is a wasteful number, since it uses less digits than its factorization.

6445581542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2177574.

The product of its digits is 768000, while the sum is 44.

The square root of 6445581542 is about 80284.3791904752. The cubic root of 6445581542 is about 1861.0328350525.

The spelling of 6445581542 in words is "six billion, four hundred forty-five million, five hundred eighty-one thousand, five hundred forty-two".