61578506611 has 4 divisors (see below), whose sum is σ = 61579088424. Its totient is φ = 61577924800.

The previous prime is 61578506597. The next prime is 61578506653. The reversal of 61578506611 is 11660587516.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61578506611 - 2²⁵ = 61544952179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61578500611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82270 + ... + 360451.

It is an arithmetic number, because the mean of its divisors is an integer number (15394772106).

Almost surely, 2^61578506611 is an apocalyptic number.

61578506611 is a deficient number, since it is larger than the sum of its proper divisors (581813).

61578506611 is a wasteful number, since it uses less digits than its factorization.

61578506611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581812.

The product of its (nonzero) digits is 302400, while the sum is 46.

The spelling of 61578506611 in words is "sixty-one billion, five hundred seventy-eight million, five hundred six thousand, six hundred eleven".