1660422663621 has 12 divisors (see below), whose sum is σ = 2398457961900. Its totient is φ = 1106916287040.

The previous prime is 1660422663611. The next prime is 1660422663637. The reversal of 1660422663621 is 1263662240661.

It is a happy number.

1660422663621 is a `hidden beast` number, since 1 + 6 + 6 + 0 + 4 + 2 + 2 + 6 + 636 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 793009841121 + 867412822500 = 890511^2 + 931350^2 .

It is not a de Polignac number, because 1660422663621 - 2⁵ = 1660422663589 is a prime.

It is a super-3 number, since 3×1660422663621³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660422663611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2350450 + ... + 2974131.

It is an arithmetic number, because the mean of its divisors is an integer number (199871496825).

Almost surely, 2^{1660422663621} is an apocalyptic number.

It is an amenable number.

1660422663621 is a deficient number, since it is larger than the sum of its proper divisors (738035298279).

1660422663621 is a wasteful number, since it uses less digits than its factorization.

1660422663621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5359236 (or 5359233 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 45.

The spelling of 1660422663621 in words is "one trillion, six hundred sixty billion, four hundred twenty-two million, six hundred sixty-three thousand, six hundred twenty-one".