61878800657 has 2 divisors, whose sum is σ = 61878800658. Its totient is φ = 61878800656.

The previous prime is 61878800617. The next prime is 61878800689. The reversal of 61878800657 is 75600887816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31329354001 + 30549446656 = 177001^2 + 174784^2 .

It is a cyclic number.

It is not a de Polignac number, because 61878800657 - 2¹⁴ = 61878784273 is a prime.

It is not a weakly prime, because it can be changed into another prime (61878800617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30939400328 + 30939400329.

It is an arithmetic number, because the mean of its divisors is an integer number (30939400329).

Almost surely, 2^61878800657 is an apocalyptic number.

It is an amenable number.

61878800657 is a deficient number, since it is larger than the sum of its proper divisors (1).

61878800657 is an equidigital number, since it uses as much as digits as its factorization.

61878800657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4515840, while the sum is 56.

The spelling of 61878800657 in words is "sixty-one billion, eight hundred seventy-eight million, eight hundred thousand, six hundred fifty-seven".