2661010406625 has 64 divisors (see below), whose sum is σ = 4604123437056. Its totient is φ = 1363398912000.

The previous prime is 2661010406617. The next prime is 2661010406629. The reversal of 2661010406625 is 5266040101662.

It is not a de Polignac number, because 2661010406625 - 2³ = 2661010406617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2661010406629) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 757209 + ... + 2428041.

It is an arithmetic number, because the mean of its divisors is an integer number (71939428704).

Almost surely, 2^{2661010406625} is an apocalyptic number.

2661010406625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2661010406625 is a deficient number, since it is larger than the sum of its proper divisors (1943113030431).

2661010406625 is a wasteful number, since it uses less digits than its factorization.

2661010406625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671019 (or 1671009 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 2661010406625 in words is "two trillion, six hundred sixty-one billion, ten million, four hundred six thousand, six hundred twenty-five".