61758430681 has 2 divisors, whose sum is σ = 61758430682. Its totient is φ = 61758430680.

The previous prime is 61758430633. The next prime is 61758430753. The reversal of 61758430681 is 18603485716.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59917248400 + 1841182281 = 244780^2 + 42909^2 .

It is a cyclic number.

It is not a de Polignac number, because 61758430681 - 2⁹ = 61758430169 is a prime.

It is a super-2 number, since 2×61758430681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61758437681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30879215340 + 30879215341.

It is an arithmetic number, because the mean of its divisors is an integer number (30879215341).

Almost surely, 2^61758430681 is an apocalyptic number.

It is an amenable number.

61758430681 is a deficient number, since it is larger than the sum of its proper divisors (1).

61758430681 is an equidigital number, since it uses as much as digits as its factorization.

61758430681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 61758430681 in words is "sixty-one billion, seven hundred fifty-eight million, four hundred thirty thousand, six hundred eighty-one".