61411645323521 has 64 divisors (see below), whose sum is σ = 67661343300096. Its totient is φ = 55501902950400.

The previous prime is 61411645323517. The next prime is 61411645323551. The reversal of 61411645323521 is 12532354611416.

It is a cyclic number.

It is not a de Polignac number, because 61411645323521 - 2² = 61411645323517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61411645323551) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15272727491 + ... + 15272731511.

It is an arithmetic number, because the mean of its divisors is an integer number (1057208489064).

Almost surely, 2^{61411645323521} is an apocalyptic number.

It is an amenable number.

61411645323521 is a deficient number, since it is larger than the sum of its proper divisors (6249697976575).

61411645323521 is a wasteful number, since it uses less digits than its factorization.

61411645323521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5242.

The product of its digits is 518400, while the sum is 44.

Adding to 61411645323521 its reverse (12532354611416), we get a palindrome (73943999934937).

The spelling of 61411645323521 in words is "sixty-one trillion, four hundred eleven billion, six hundred forty-five million, three hundred twenty-three thousand, five hundred twenty-one".