145694440039681 has 16 divisors (see below), whose sum is σ = 157727099593728. Its totient is φ = 133779729052800.

The previous prime is 145694440039661. The next prime is 145694440039691. The reversal of 145694440039681 is 186930044496541.

It is a cyclic number.

It is not a de Polignac number, because 145694440039681 - 2⁷ = 145694440039553 is a prime.

It is a super-4 number, since 4×145694440039681⁴ (a number of 58 digits) contains 4444 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 (145694440039661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102115045 + ... + 103531981.

It is an arithmetic number, because the mean of its divisors is an integer number (9857943724608).

Almost surely, 2^{145694440039681} is an apocalyptic number.

It is an amenable number.

145694440039681 is a deficient number, since it is larger than the sum of its proper divisors (12032659554047).

145694440039681 is a wasteful number, since it uses less digits than its factorization.

145694440039681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458552.

The product of its (nonzero) digits is 89579520, while the sum is 64.

The spelling of 145694440039681 in words is "one hundred forty-five trillion, six hundred ninety-four billion, four hundred forty million, thirty-nine thousand, six hundred eighty-one".