73512421537 has 2 divisors, whose sum is σ = 73512421538. Its totient is φ = 73512421536.

The previous prime is 73512421517. The next prime is 73512421583.

It is a happy number.

73512421537 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71524688481 + 1987733056 = 267441^2 + 44584^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 73512421537 - 2²³ = 73504032929 is a prime.

It is a super-2 number, since 2×73512421537² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 73512421537.

It is not a weakly prime, because it can be changed into another prime (73512421517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36756210768 + 36756210769.

It is an arithmetic number, because the mean of its divisors is an integer number (36756210769).

Almost surely, 2^73512421537 is an apocalyptic number.

It is an amenable number.

73512421537 is a deficient number, since it is larger than the sum of its proper divisors (1).

73512421537 is an equidigital number, since it uses as much as digits as its factorization.

73512421537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 176400, while the sum is 40.

The spelling of 73512421537 in words is "seventy-three billion, five hundred twelve million, four hundred twenty-one thousand, five hundred thirty-seven".