61484554561 has 2 divisors, whose sum is σ = 61484554562. Its totient is φ = 61484554560.

The previous prime is 61484554559. The next prime is 61484554583. The reversal of 61484554561 is 16545548416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61092514561 + 392040000 = 247169^2 + 19800^2 .

It is a cyclic number.

It is not a de Polignac number, because 61484554561 - 2¹ = 61484554559 is a prime.

Together with 61484554559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61484554541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30742277280 + 30742277281.

It is an arithmetic number, because the mean of its divisors is an integer number (30742277281).

Almost surely, 2^61484554561 is an apocalyptic number.

It is an amenable number.

61484554561 is a deficient number, since it is larger than the sum of its proper divisors (1).

61484554561 is an equidigital number, since it uses as much as digits as its factorization.

61484554561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304000, while the sum is 49.

The spelling of 61484554561 in words is "sixty-one billion, four hundred eighty-four million, five hundred fifty-four thousand, five hundred sixty-one".