61416542136421 has 2 divisors, whose sum is σ = 61416542136422. Its totient is φ = 61416542136420.

The previous prime is 61416542136377. The next prime is 61416542136457. The reversal of 61416542136421 is 12463124561416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61322838192100 + 93703944321 = 7830890^2 + 306111^2 .

It is a cyclic number.

It is not a de Polignac number, because 61416542136421 - 2³⁷ = 61279103182949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61416542136221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30708271068210 + 30708271068211.

It is an arithmetic number, because the mean of its divisors is an integer number (30708271068211).

Almost surely, 2^{61416542136421} is an apocalyptic number.

It is an amenable number.

61416542136421 is a deficient number, since it is larger than the sum of its proper divisors (1).

61416542136421 is an equidigital number, since it uses as much as digits as its factorization.

61416542136421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 46.

Adding to 61416542136421 its reverse (12463124561416), we get a palindrome (73879666697837).

The spelling of 61416542136421 in words is "sixty-one trillion, four hundred sixteen billion, five hundred forty-two million, one hundred thirty-six thousand, four hundred twenty-one".