61982077447 has 2 divisors, whose sum is σ = 61982077448. Its totient is φ = 61982077446.

The previous prime is 61982077439. The next prime is 61982077501. The reversal of 61982077447 is 74477028916.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61982077447 - 2³ = 61982077439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61982077747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30991038723 + 30991038724.

It is an arithmetic number, because the mean of its divisors is an integer number (30991038724).

Almost surely, 2^61982077447 is an apocalyptic number.

61982077447 is a deficient number, since it is larger than the sum of its proper divisors (1).

61982077447 is an equidigital number, since it uses as much as digits as its factorization.

61982077447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4741632, while the sum is 55.

The spelling of 61982077447 in words is "sixty-one billion, nine hundred eighty-two million, seventy-seven thousand, four hundred forty-seven".