2661600009025 has 6 divisors (see below), whose sum is σ = 3300384011222. Its totient is φ = 2129280007200.

The previous prime is 2661600009011. The next prime is 2661600009049. The reversal of 2661600009025 is 5209000061662.

It can be written as a sum of positive squares in 3 ways, for example, as 341169305409 + 2320430703616 = 584097^2 + 1523296^2 .

It is not a de Polignac number, because 2661600009025 - 2⁷ = 2661600008897 is a prime.

It is a super-2 number, since 2×2661600009025² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53232000156 + ... + 53232000205.

Almost surely, 2^{2661600009025} is an apocalyptic number.

2661600009025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2661600009025 is a deficient number, since it is larger than the sum of its proper divisors (638784002197).

2661600009025 is a wasteful number, since it uses less digits than its factorization.

2661600009025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106464000371 (or 106464000366 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 2661600009025 in words is "two trillion, six hundred sixty-one billion, six hundred million, nine thousand, twenty-five".