1661366622029 has 8 divisors (see below), whose sum is σ = 1664178247680. Its totient is φ = 1658557330416.

The previous prime is 1661366621983. The next prime is 1661366622037. The reversal of 1661366622029 is 9202266631661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1661366622029 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 (1661366822029) 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, 844244 + ... + 2008850.

It is an arithmetic number, because the mean of its divisors is an integer number (208022280960).

Almost surely, 2^{1661366622029} is an apocalyptic number.

It is an amenable number.

1661366622029 is a deficient number, since it is larger than the sum of its proper divisors (2811625651).

1661366622029 is a wasteful number, since it uses less digits than its factorization.

1661366622029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167019.

The product of its (nonzero) digits is 1679616, while the sum is 50.

The spelling of 1661366622029 in words is "one trillion, six hundred sixty-one billion, three hundred sixty-six million, six hundred twenty-two thousand, twenty-nine".