61894217377 has 2 divisors, whose sum is σ = 61894217378. Its totient is φ = 61894217376.

The previous prime is 61894217369. The next prime is 61894217387. The reversal of 61894217377 is 77371249816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58940186176 + 2954031201 = 242776^2 + 54351^2 .

It is a cyclic number.

It is not a de Polignac number, because 61894217377 - 2³ = 61894217369 is a prime.

It is a super-2 number, since 2×61894217377² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61894217387) 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, 30947108688 + 30947108689.

It is an arithmetic number, because the mean of its divisors is an integer number (30947108689).

Almost surely, 2^61894217377 is an apocalyptic number.

It is an amenable number.

61894217377 is a deficient number, since it is larger than the sum of its proper divisors (1).

61894217377 is an equidigital number, since it uses as much as digits as its factorization.

61894217377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3556224, while the sum is 55.

The spelling of 61894217377 in words is "sixty-one billion, eight hundred ninety-four million, two hundred seventeen thousand, three hundred seventy-seven".