3521201857561 has 8 divisors (see below), whose sum is σ = 3856894530120. Its totient is φ = 3199793979648.

The previous prime is 3521201857559. The next prime is 3521201857567. The reversal of 3521201857561 is 1657581021253.

It can be written as a sum of positive squares in 4 ways, for example, as 1027547142400 + 2493654715161 = 1013680^2 + 1579131^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3521201857561 - 2¹ = 3521201857559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3521201857567) 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, 3571198146 + ... + 3571199131.

It is an arithmetic number, because the mean of its divisors is an integer number (482111816265).

Almost surely, 2^{3521201857561} is an apocalyptic number.

It is an amenable number.

3521201857561 is a deficient number, since it is larger than the sum of its proper divisors (335692672559).

3521201857561 is a wasteful number, since it uses less digits than its factorization.

3521201857561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7142397323.

The product of its (nonzero) digits is 504000, while the sum is 46.

The spelling of 3521201857561 in words is "three trillion, five hundred twenty-one billion, two hundred one million, eight hundred fifty-seven thousand, five hundred sixty-one".