37858685621 has 2 divisors, whose sum is σ = 37858685622. Its totient is φ = 37858685620.

The previous prime is 37858685611. The next prime is 37858685633. The reversal of 37858685621 is 12658685873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26851738225 + 11006947396 = 163865^2 + 104914^2 .

It is an emirp because it is prime and its reverse (12658685873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37858685621 - 2¹⁰ = 37858684597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37858685611) 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, 18929342810 + 18929342811.

It is an arithmetic number, because the mean of its divisors is an integer number (18929342811).

Almost surely, 2^37858685621 is an apocalyptic number.

It is an amenable number.

37858685621 is a deficient number, since it is larger than the sum of its proper divisors (1).

37858685621 is an equidigital number, since it uses as much as digits as its factorization.

37858685621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19353600, while the sum is 59.

The spelling of 37858685621 in words is "thirty-seven billion, eight hundred fifty-eight million, six hundred eighty-five thousand, six hundred twenty-one".