1661170940776 has 32 divisors (see below), whose sum is σ = 3294639236160. Its totient is φ = 783589859712.

The previous prime is 1661170940771. The next prime is 1661170940789. The reversal of 1661170940776 is 6770490711661.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1661170940771) 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, 61822890 + ... + 61849753.

It is an arithmetic number, because the mean of its divisors is an integer number (102957476130).

Almost surely, 2^{1661170940776} is an apocalyptic number.

It is an amenable number.

1661170940776 is a deficient number, since it is larger than the sum of its proper divisors (1633468295384).

1661170940776 is a wasteful number, since it uses less digits than its factorization.

1661170940776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123672745 (or 123672741 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 55.

The spelling of 1661170940776 in words is "one trillion, six hundred sixty-one billion, one hundred seventy million, nine hundred forty thousand, seven hundred seventy-six".