61649676541 has 4 divisors (see below), whose sum is σ = 62494192732. Its totient is φ = 60805160352.

The previous prime is 61649676511. The next prime is 61649676553. The reversal of 61649676541 is 14567694616.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47514844441 + 14134832100 = 217979^2 + 118890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61649676541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61649676511) 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, 422257986 + ... + 422258131.

It is an arithmetic number, because the mean of its divisors is an integer number (15623548183).

Almost surely, 2^61649676541 is an apocalyptic number.

It is an amenable number.

61649676541 is a deficient number, since it is larger than the sum of its proper divisors (844516191).

61649676541 is an equidigital number, since it uses as much as digits as its factorization.

61649676541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844516190.

The product of its digits is 6531840, while the sum is 55.

The spelling of 61649676541 in words is "sixty-one billion, six hundred forty-nine million, six hundred seventy-six thousand, five hundred forty-one".