2521656506 has 16 divisors (see below), whose sum is σ = 3821535744. Its totient is φ = 1247826384.

The previous prime is 2521656503. The next prime is 2521656509. The reversal of 2521656506 is 6056561252.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2521656503) and next prime (2521656509).

It is a self number, because there is not a number n which added to its sum of digits gives 2521656506.

It is not an unprimeable number, because it can be changed into a prime (2521656503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499511 + ... + 504533.

It is an arithmetic number, because the mean of its divisors is an integer number (238845984).

Almost surely, 2^2521656506 is an apocalyptic number.

2521656506 is a deficient number, since it is larger than the sum of its proper divisors (1299879238).

2521656506 is a wasteful number, since it uses less digits than its factorization.

2521656506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7565.

The product of its (nonzero) digits is 108000, while the sum is 38.

The square root of 2521656506 is about 50216.0980762146. The cubic root of 2521656506 is about 1361.1165329968.

The spelling of 2521656506 in words is "two billion, five hundred twenty-one million, six hundred fifty-six thousand, five hundred six".