61773640441 has 2 divisors, whose sum is σ = 61773640442. Its totient is φ = 61773640440.

The previous prime is 61773640433. The next prime is 61773640499. The reversal of 61773640441 is 14404637716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56693514816 + 5080125625 = 238104^2 + 71275^2 .

It is a cyclic number.

It is not a de Polignac number, because 61773640441 - 2³ = 61773640433 is a prime.

It is not a weakly prime, because it can be changed into another prime (61773643441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30886820220 + 30886820221.

It is an arithmetic number, because the mean of its divisors is an integer number (30886820221).

Almost surely, 2^61773640441 is an apocalyptic number.

It is an amenable number.

61773640441 is a deficient number, since it is larger than the sum of its proper divisors (1).

61773640441 is an equidigital number, since it uses as much as digits as its factorization.

61773640441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 43.

The spelling of 61773640441 in words is "sixty-one billion, seven hundred seventy-three million, six hundred forty thousand, four hundred forty-one".