42786400665637 has 2 divisors, whose sum is σ = 42786400665638. Its totient is φ = 42786400665636.

The previous prime is 42786400665563. The next prime is 42786400665647. The reversal of 42786400665637 is 73656600468724.

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., 23204943756801 + 19581456908836 = 4817151^2 + 4425094^2 .

It is a cyclic number.

It is not a de Polignac number, because 42786400665637 - 2¹⁹ = 42786400141349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42786400665647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21393200332818 + 21393200332819.

It is an arithmetic number, because the mean of its divisors is an integer number (21393200332819).

Almost surely, 2^{42786400665637} is an apocalyptic number.

It is an amenable number.

42786400665637 is a deficient number, since it is larger than the sum of its proper divisors (1).

42786400665637 is an equidigital number, since it uses as much as digits as its factorization.

42786400665637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243855360, while the sum is 64.

The spelling of 42786400665637 in words is "forty-two trillion, seven hundred eighty-six billion, four hundred million, six hundred sixty-five thousand, six hundred thirty-seven".