2556515501 has 2 divisors, whose sum is σ = 2556515502. Its totient is φ = 2556515500.

The previous prime is 2556515497. The next prime is 2556515519. The reversal of 2556515501 is 1055156552.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1564202500 + 992313001 = 39550^2 + 31501^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556515501 - 2² = 2556515497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2556515201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278257750 + 1278257751.

It is an arithmetic number, because the mean of its divisors is an integer number (1278257751).

Almost surely, 2^2556515501 is an apocalyptic number.

It is an amenable number.

2556515501 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556515501 is an equidigital number, since it uses as much as digits as its factorization.

2556515501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37500, while the sum is 35.

The square root of 2556515501 is about 50561.9966081246. The cubic root of 2556515501 is about 1367.3598078708.

The spelling of 2556515501 in words is "two billion, five hundred fifty-six million, five hundred fifteen thousand, five hundred one".