2551530878521 has 2 divisors, whose sum is σ = 2551530878522. Its totient is φ = 2551530878520.

The previous prime is 2551530878489. The next prime is 2551530878531. The reversal of 2551530878521 is 1258780351552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2549246516496 + 2284362025 = 1596636^2 + 47795^2 .

It is a cyclic number.

It is not a de Polignac number, because 2551530878521 - 2⁵ = 2551530878489 is a prime.

It is a super-2 number, since 2×2551530878521² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2551530878531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275765439260 + 1275765439261.

It is an arithmetic number, because the mean of its divisors is an integer number (1275765439261).

Almost surely, 2^{2551530878521} is an apocalyptic number.

It is an amenable number.

2551530878521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551530878521 is an equidigital number, since it uses as much as digits as its factorization.

2551530878521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360000, while the sum is 52.

The spelling of 2551530878521 in words is "two trillion, five hundred fifty-one billion, five hundred thirty million, eight hundred seventy-eight thousand, five hundred twenty-one".