661025646026 has 16 divisors (see below), whose sum is σ = 1025985795840. Its totient is φ = 319036077360.

The previous prime is 661025646023. The next prime is 661025646059. The reversal of 661025646026 is 620646520166.

It is a happy number.

661025646026 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (661025646023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1189730 + ... + 1654541.

It is an arithmetic number, because the mean of its divisors is an integer number (64124112240).

Almost surely, 2^661025646026 is an apocalyptic number.

661025646026 is a deficient number, since it is larger than the sum of its proper divisors (364960149814).

661025646026 is a wasteful number, since it uses less digits than its factorization.

661025646026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2848309.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 661025646026 in words is "six hundred sixty-one billion, twenty-five million, six hundred forty-six thousand, twenty-six".