65215201611561 has 32 divisors (see below), whose sum is σ = 90253362739200. Its totient is φ = 41867096356800.

The previous prime is 65215201611557. The next prime is 65215201611587. The reversal of 65215201611561 is 16511610251256.

It is not a de Polignac number, because 65215201611561 - 2² = 65215201611557 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65215201611541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18727951 + ... + 21935508.

It is an arithmetic number, because the mean of its divisors is an integer number (2820417585600).

Almost surely, 2^{65215201611561} is an apocalyptic number.

It is an amenable number.

65215201611561 is a deficient number, since it is larger than the sum of its proper divisors (25038161127639).

65215201611561 is a wasteful number, since it uses less digits than its factorization.

65215201611561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40663709.

The product of its (nonzero) digits is 108000, while the sum is 42.

The spelling of 65215201611561 in words is "sixty-five trillion, two hundred fifteen billion, two hundred one million, six hundred eleven thousand, five hundred sixty-one".