2521603161 has 72 divisors (see below), whose sum is σ = 4659692544. Its totient is φ = 1299291840.

The previous prime is 2521603153. The next prime is 2521603211. The reversal of 2521603161 is 1613061252.

2521603161 is a `hidden beast` number, since 2 + 52 + 1 + 603 + 1 + 6 + 1 = 666.

It is not a de Polignac number, because 2521603161 - 2³ = 2521603153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2521603121) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 614031 + ... + 618123.

It is an arithmetic number, because the mean of its divisors is an integer number (64717952).

Almost surely, 2^2521603161 is an apocalyptic number.

2521603161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2521603161 is a deficient number, since it is larger than the sum of its proper divisors (2138089383).

2521603161 is a wasteful number, since it uses less digits than its factorization.

2521603161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4251 (or 4241 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 2521603161 is about 50215.5669190342. The cubic root of 2521603161 is about 1361.1069349048.

The spelling of 2521603161 in words is "two billion, five hundred twenty-one million, six hundred three thousand, one hundred sixty-one".