61544065405 has 32 divisors (see below), whose sum is σ = 76965216768. Its totient is φ = 47205849600.

The previous prime is 61544065357. The next prime is 61544065421. The reversal of 61544065405 is 50456044516.

It is not a de Polignac number, because 61544065405 - 2²⁵ = 61510510973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6828412 + ... + 6837418.

It is an arithmetic number, because the mean of its divisors is an integer number (2405163024).

Almost surely, 2^61544065405 is an apocalyptic number.

It is an amenable number.

61544065405 is a deficient number, since it is larger than the sum of its proper divisors (15421151363).

61544065405 is a wasteful number, since it uses less digits than its factorization.

61544065405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9637.

The product of its (nonzero) digits is 288000, while the sum is 40.

The spelling of 61544065405 in words is "sixty-one billion, five hundred forty-four million, sixty-five thousand, four hundred five".