61774962421 has 2 divisors, whose sum is σ = 61774962422. Its totient is φ = 61774962420.

The previous prime is 61774962383. The next prime is 61774962433. The reversal of 61774962421 is 12426947716.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40114481796 + 21660480625 = 200286^2 + 147175^2 .

It is a cyclic number.

It is not a de Polignac number, because 61774962421 - 2⁹ = 61774961909 is a prime.

It is a super-3 number, since 3×61774962421³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61774962121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30887481210 + 30887481211.

It is an arithmetic number, because the mean of its divisors is an integer number (30887481211).

Almost surely, 2^61774962421 is an apocalyptic number.

It is an amenable number.

61774962421 is a deficient number, since it is larger than the sum of its proper divisors (1).

61774962421 is an equidigital number, since it uses as much as digits as its factorization.

61774962421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 49.

The spelling of 61774962421 in words is "sixty-one billion, seven hundred seventy-four million, nine hundred sixty-two thousand, four hundred twenty-one".