76530757621 has 2 divisors, whose sum is σ = 76530757622. Its totient is φ = 76530757620.

The previous prime is 76530757603. The next prime is 76530757649. The reversal of 76530757621 is 12675703567.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76366559025 + 164198596 = 276345^2 + 12814^2 .

It is a cyclic number.

It is not a de Polignac number, because 76530757621 - 2¹⁹ = 76530233333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76530757601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38265378810 + 38265378811.

It is an arithmetic number, because the mean of its divisors is an integer number (38265378811).

Almost surely, 2^76530757621 is an apocalyptic number.

It is an amenable number.

76530757621 is a deficient number, since it is larger than the sum of its proper divisors (1).

76530757621 is an equidigital number, since it uses as much as digits as its factorization.

76530757621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1852200, while the sum is 49.

The spelling of 76530757621 in words is "seventy-six billion, five hundred thirty million, seven hundred fifty-seven thousand, six hundred twenty-one".