10142551665621 has 12 divisors (see below), whose sum is σ = 15512137841772. Its totient is φ = 6363953986176.

The previous prime is 10142551665569. The next prime is 10142551665629. The reversal of 10142551665621 is 12656615524101.

10142551665621 is a `hidden beast` number, since 1 + 0 + 1 + 4 + 2 + 5 + 5 + 16 + 6 + 5 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7400086496100 + 2742465169521 = 2720310^2 + 1656039^2 .

It is not a de Polignac number, because 10142551665621 - 2²² = 10142547471317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10142551665629) 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, 33145593526 + ... + 33145593831.

It is an arithmetic number, because the mean of its divisors is an integer number (1292678153481).

Almost surely, 2^{10142551665621} is an apocalyptic number.

It is an amenable number.

10142551665621 is a deficient number, since it is larger than the sum of its proper divisors (5369586176151).

10142551665621 is a wasteful number, since it uses less digits than its factorization.

10142551665621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66291187380 (or 66291187377 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 10142551665621 in words is "ten trillion, one hundred forty-two billion, five hundred fifty-one million, six hundred sixty-five thousand, six hundred twenty-one".