7543521637 has 2 divisors, whose sum is σ = 7543521638. Its totient is φ = 7543521636.

The previous prime is 7543521613. The next prime is 7543521697. The reversal of 7543521637 is 7361253457.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6601400001 + 942121636 = 81249^2 + 30694^2 .

It is a cyclic number.

It is not a de Polignac number, because 7543521637 - 2⁷ = 7543521509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7543521593 and 7543521602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7543521697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3771760818 + 3771760819.

It is an arithmetic number, because the mean of its divisors is an integer number (3771760819).

Almost surely, 2^7543521637 is an apocalyptic number.

It is an amenable number.

7543521637 is a deficient number, since it is larger than the sum of its proper divisors (1).

7543521637 is an equidigital number, since it uses as much as digits as its factorization.

7543521637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 529200, while the sum is 43.

The square root of 7543521637 is about 86853.4491946060. The cubic root of 7543521637 is about 1961.2127747795.

The spelling of 7543521637 in words is "seven billion, five hundred forty-three million, five hundred twenty-one thousand, six hundred thirty-seven".