1661269707274 has 32 divisors (see below), whose sum is σ = 2570437437120. Its totient is φ = 804853400832.

The previous prime is 1661269707271. The next prime is 1661269707281. The reversal of 1661269707274 is 4727079621661.

It is a happy number.

It is a super-2 number, since 2×1661269707274² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1661269707271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25455217 + ... + 25520395.

It is an arithmetic number, because the mean of its divisors is an integer number (80326169910).

Almost surely, 2^{1661269707274} is an apocalyptic number.

1661269707274 is a deficient number, since it is larger than the sum of its proper divisors (909167729846).

1661269707274 is a wasteful number, since it uses less digits than its factorization.

1661269707274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68214.

The product of its (nonzero) digits is 10668672, while the sum is 58.

The spelling of 1661269707274 in words is "one trillion, six hundred sixty-one billion, two hundred sixty-nine million, seven hundred seven thousand, two hundred seventy-four".