1661122426501 has 16 divisors (see below), whose sum is σ = 1687367088000. Its totient is φ = 1635092733888.

The previous prime is 1661122426471. The next prime is 1661122426549. The reversal of 1661122426501 is 1056242211661.

It is a cyclic number.

It is not a de Polignac number, because 1661122426501 - 2⁷ = 1661122426373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661122421501) 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, 24612400 + ... + 24679798.

It is an arithmetic number, because the mean of its divisors is an integer number (105460443000).

Almost surely, 2^{1661122426501} is an apocalyptic number.

It is an amenable number.

1661122426501 is a deficient number, since it is larger than the sum of its proper divisors (26244661499).

1661122426501 is a wasteful number, since it uses less digits than its factorization.

1661122426501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68988.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 1661122426501 in words is "one trillion, six hundred sixty-one billion, one hundred twenty-two million, four hundred twenty-six thousand, five hundred one".