445747770547661 has 16 divisors (see below), whose sum is σ = 449815180687488. Its totient is φ = 441699349560000.

The previous prime is 445747770547621. The next prime is 445747770547679. The reversal of 445747770547661 is 166745077747544.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-445747770547661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445747770547621) 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, 229644311 + ... + 231577211.

It is an arithmetic number, because the mean of its divisors is an integer number (28113448792968).

Almost surely, 2^{445747770547661} is an apocalyptic number.

It is an amenable number.

445747770547661 is a deficient number, since it is larger than the sum of its proper divisors (4067410139827).

445747770547661 is a wasteful number, since it uses less digits than its factorization.

445747770547661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937812.

The product of its (nonzero) digits is 3872332800, while the sum is 74.

The spelling of 445747770547661 in words is "four hundred forty-five trillion, seven hundred forty-seven billion, seven hundred seventy million, five hundred forty-seven thousand, six hundred sixty-one".