1660422663601 has 4 divisors (see below), whose sum is σ = 1788147483892. Its totient is φ = 1532697843312.

The previous prime is 1660422663589. The next prime is 1660422663611. The reversal of 1660422663601 is 1063662240661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 613942767025 + 1046479896576 = 783545^2 + 1022976^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660422663601 - 2¹¹ = 1660422661553 is a prime.

It is a super-3 number, since 3×1660422663601³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 63862410126 + ... + 63862410151.

It is an arithmetic number, because the mean of its divisors is an integer number (447036870973).

Almost surely, 2^{1660422663601} is an apocalyptic number.

It is an amenable number.

1660422663601 is a deficient number, since it is larger than the sum of its proper divisors (127724820291).

1660422663601 is a wasteful number, since it uses less digits than its factorization.

1660422663601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127724820290.

The product of its (nonzero) digits is 373248, while the sum is 43.

The spelling of 1660422663601 in words is "one trillion, six hundred sixty billion, four hundred twenty-two million, six hundred sixty-three thousand, six hundred one".