1861428710377 has 2 divisors, whose sum is σ = 1861428710378. Its totient is φ = 1861428710376.

The previous prime is 1861428710359. The next prime is 1861428710417. The reversal of 1861428710377 is 7730178241681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1739032988176 + 122395722201 = 1318724^2 + 349851^2 .

It is a cyclic number.

It is not a de Polignac number, because 1861428710377 - 2⁷ = 1861428710249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1861428710077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930714355188 + 930714355189.

It is an arithmetic number, because the mean of its divisors is an integer number (930714355189).

Almost surely, 2^{1861428710377} is an apocalyptic number.

It is an amenable number.

1861428710377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861428710377 is an equidigital number, since it uses as much as digits as its factorization.

1861428710377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3161088, while the sum is 55.

The spelling of 1861428710377 in words is "one trillion, eight hundred sixty-one billion, four hundred twenty-eight million, seven hundred ten thousand, three hundred seventy-seven".