661270167860 has 24 divisors (see below), whose sum is σ = 1414868625576. Its totient is φ = 259517348480.

The previous prime is 661270167823. The next prime is 661270167869. The reversal of 661270167860 is 68761072166.

It can be written as a sum of positive squares in 4 ways, for example, as 153910274596 + 507359893264 = 392314^2 + 712292^2 .

It is a junction number, because it is equal to n+sod(n) for n = 661270167799 and 661270167808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661270167869) 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, 311918831 + ... + 311920950.

It is an arithmetic number, because the mean of its divisors is an integer number (58952859399).

Almost surely, 2^661270167860 is an apocalyptic number.

It is an amenable number.

661270167860 is an abundant number, since it is smaller than the sum of its proper divisors (753598457716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661270167860 is a wasteful number, since it uses less digits than its factorization.

661270167860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623839843 (or 623839841 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 661270167860 in words is "six hundred sixty-one billion, two hundred seventy million, one hundred sixty-seven thousand, eight hundred sixty".