2516556761 has 2 divisors, whose sum is σ = 2516556762. Its totient is φ = 2516556760.

The previous prime is 2516556737. The next prime is 2516556787. The reversal of 2516556761 is 1676556152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2500000000 + 16556761 = 50000^2 + 4069^2 .

It is a cyclic number.

It is not a de Polignac number, because 2516556761 - 2⁶ = 2516556697 is a prime.

It is a super-2 number, since 2×2516556761² = 12666115862669622242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2516550761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1258278380 + 1258278381.

It is an arithmetic number, because the mean of its divisors is an integer number (1258278381).

Almost surely, 2^2516556761 is an apocalyptic number.

It is an amenable number.

2516556761 is a deficient number, since it is larger than the sum of its proper divisors (1).

2516556761 is an equidigital number, since it uses as much as digits as its factorization.

2516556761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378000, while the sum is 44.

The square root of 2516556761 is about 50165.2943876541. The cubic root of 2516556761 is about 1360.1983492782.

It can be divided in two parts, 25 and 16556761, that multiplied together give a square (413919025 = 20345²).

The spelling of 2516556761 in words is "two billion, five hundred sixteen million, five hundred fifty-six thousand, seven hundred sixty-one".