1642200681 has 8 divisors (see below), whose sum is σ = 2388655584. Its totient is φ = 995273120.

The previous prime is 1642200653. The next prime is 1642200683. The reversal of 1642200681 is 1860022461.

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

It is a cyclic number.

It is not a de Polignac number, because 1642200681 - 2¹⁵ = 1642167913 is a prime.

It is a super-2 number, since 2×1642200681² = 5393646153353727522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1642200683) 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, 24881796 + ... + 24881861.

It is an arithmetic number, because the mean of its divisors is an integer number (298581948).

Almost surely, 2^1642200681 is an apocalyptic number.

1642200681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1642200681 is a deficient number, since it is larger than the sum of its proper divisors (746454903).

1642200681 is a wasteful number, since it uses less digits than its factorization.

1642200681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49763671.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 1642200681 is about 40524.0753256629. The cubic root of 1642200681 is about 1179.8009529719.

The spelling of 1642200681 in words is "one billion, six hundred forty-two million, two hundred thousand, six hundred eighty-one".