3772561861 has 2 divisors, whose sum is σ = 3772561862. Its totient is φ = 3772561860.

The previous prime is 3772561841. The next prime is 3772561931. The reversal of 3772561861 is 1681652773.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2498500225 + 1274061636 = 49985^2 + 35694^2 .

It is an emirp because it is prime and its reverse (1681652773) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3772561861 - 2⁵ = 3772561829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3772561841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1886280930 + 1886280931.

It is an arithmetic number, because the mean of its divisors is an integer number (1886280931).

Almost surely, 2^3772561861 is an apocalyptic number.

It is an amenable number.

3772561861 is a deficient number, since it is larger than the sum of its proper divisors (1).

3772561861 is an equidigital number, since it uses as much as digits as its factorization.

3772561861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 46.

The square root of 3772561861 is about 61421.1841386992. The cubic root of 3772561861 is about 1556.7258005579.

The spelling of 3772561861 in words is "three billion, seven hundred seventy-two million, five hundred sixty-one thousand, eight hundred sixty-one".