61519974401 has 2 divisors, whose sum is σ = 61519974402. Its totient is φ = 61519974400.

The previous prime is 61519974379. The next prime is 61519974403. The reversal of 61519974401 is 10447991516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41616408001 + 19903566400 = 204001^2 + 141080^2 .

It is a cyclic number.

It is not a de Polignac number, because 61519974401 - 2⁶ = 61519974337 is a prime.

It is a Sophie Germain prime.

Together with 61519974403, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61519974403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30759987200 + 30759987201.

It is an arithmetic number, because the mean of its divisors is an integer number (30759987201).

Almost surely, 2^61519974401 is an apocalyptic number.

It is an amenable number.

61519974401 is a deficient number, since it is larger than the sum of its proper divisors (1).

61519974401 is an equidigital number, since it uses as much as digits as its factorization.

61519974401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 61519974401 in words is "sixty-one billion, five hundred nineteen million, nine hundred seventy-four thousand, four hundred one".