6521406145 has 8 divisors (see below), whose sum is σ = 7826705640. Its totient is φ = 5216446080.

The previous prime is 6521406121. The next prime is 6521406179. The reversal of 6521406145 is 5416041256.

It can be written as a sum of positive squares in 4 ways, for example, as 87441201 + 6433964944 = 9351^2 + 80212^2 .

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

It is not a de Polignac number, because 6521406145 - 2¹⁷ = 6521275073 is a prime.

It is a super-2 number, since 2×6521406145² = 85057476216087522050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6521406145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40476 + ... + 121165.

It is an arithmetic number, because the mean of its divisors is an integer number (978338205).

Almost surely, 2^6521406145 is an apocalyptic number.

It is an amenable number.

6521406145 is a deficient number, since it is larger than the sum of its proper divisors (1305299495).

6521406145 is a wasteful number, since it uses less digits than its factorization.

6521406145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169715.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 6521406145 is about 80755.2236390935. The cubic root of 6521406145 is about 1868.3020175446.

The spelling of 6521406145 in words is "six billion, five hundred twenty-one million, four hundred six thousand, one hundred forty-five".