83940784637 has 2 divisors, whose sum is σ = 83940784638. Its totient is φ = 83940784636.

The previous prime is 83940784607. The next prime is 83940784663. The reversal of 83940784637 is 73648704938.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83055781636 + 885003001 = 288194^2 + 29749^2 .

It is a cyclic number.

It is not a de Polignac number, because 83940784637 - 2⁶ = 83940784573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83940784607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41970392318 + 41970392319.

It is an arithmetic number, because the mean of its divisors is an integer number (41970392319).

Almost surely, 2^83940784637 is an apocalyptic number.

It is an amenable number.

83940784637 is a deficient number, since it is larger than the sum of its proper divisors (1).

83940784637 is an equidigital number, since it uses as much as digits as its factorization.

83940784637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24385536, while the sum is 59.

The spelling of 83940784637 in words is "eighty-three billion, nine hundred forty million, seven hundred eighty-four thousand, six hundred thirty-seven".