37618591861 has 2 divisors, whose sum is σ = 37618591862. Its totient is φ = 37618591860.

The previous prime is 37618591819. The next prime is 37618591889. The reversal of 37618591861 is 16819581673.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23145058225 + 14473533636 = 152135^2 + 120306^2 .

It is a cyclic number.

It is not a de Polignac number, because 37618591861 - 2⁷ = 37618591733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37618591811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18809295930 + 18809295931.

It is an arithmetic number, because the mean of its divisors is an integer number (18809295931).

Almost surely, 2^37618591861 is an apocalyptic number.

It is an amenable number.

37618591861 is a deficient number, since it is larger than the sum of its proper divisors (1).

37618591861 is an equidigital number, since it uses as much as digits as its factorization.

37618591861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 55.

The spelling of 37618591861 in words is "thirty-seven billion, six hundred eighteen million, five hundred ninety-one thousand, eight hundred sixty-one".