1646872758081 has 12 divisors (see below), whose sum is σ = 2434137513808. Its totient is φ = 1072382260824.

The previous prime is 1646872758059. The next prime is 1646872758107. The reversal of 1646872758081 is 1808572786461.

It is a happy number.

1646872758081 is a `hidden beast` number, since 1 + 6 + 46 + 8 + 7 + 2 + 7 + 580 + 8 + 1 = 666.

It is not a de Polignac number, because 1646872758081 - 2²³ = 1646864369473 is a prime.

It is a super-2 number, since 2×1646872758081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1646872758781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2127742195 + ... + 2127742968.

Almost surely, 2^{1646872758081} is an apocalyptic number.

It is an amenable number.

1646872758081 is a deficient number, since it is larger than the sum of its proper divisors (787264755727).

1646872758081 is a wasteful number, since it uses less digits than its factorization.

1646872758081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4255485212 (or 4255485209 counting only the distinct ones).

The product of its (nonzero) digits is 36126720, while the sum is 63.

The spelling of 1646872758081 in words is "one trillion, six hundred forty-six billion, eight hundred seventy-two million, seven hundred fifty-eight thousand, eighty-one".