1201561061640 has 64 divisors (see below), whose sum is σ = 3612468844800. Its totient is φ = 319724224512.

The previous prime is 1201561061621. The next prime is 1201561061669. The reversal of 1201561061640 is 461601651021.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10757625 + ... + 10868744.

It is an arithmetic number, because the mean of its divisors is an integer number (56444825700).

Almost surely, 2^{1201561061640} is an apocalyptic number.

1201561061640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201561061640 is an abundant number, since it is smaller than the sum of its proper divisors (2410907783160).

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

1201561061640 is a wasteful number, since it uses less digits than its factorization.

1201561061640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21626846 (or 21626842 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The spelling of 1201561061640 in words is "one trillion, two hundred one billion, five hundred sixty-one million, sixty-one thousand, six hundred forty".