654166106421 has 16 divisors (see below), whose sum is σ = 910691598336. Its totient is φ = 416898486576.

The previous prime is 654166106411. The next prime is 654166106437. The reversal of 654166106421 is 124601661456.

It is a happy number.

It is not a de Polignac number, because 654166106421 - 2⁶ = 654166106357 is a prime.

It is a super-2 number, since 2×654166106421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654166106401) 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 15 ways as a sum of consecutive naturals, for example, 2735725 + ... + 2965218.

It is an arithmetic number, because the mean of its divisors is an integer number (56918224896).

Almost surely, 2^654166106421 is an apocalyptic number.

It is an amenable number.

654166106421 is a deficient number, since it is larger than the sum of its proper divisors (256525491915).

654166106421 is a wasteful number, since it uses less digits than its factorization.

654166106421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5702632.

The product of its (nonzero) digits is 207360, while the sum is 42.

Adding to 654166106421 its reverse (124601661456), we get a palindrome (778767767877).

The spelling of 654166106421 in words is "six hundred fifty-four billion, one hundred sixty-six million, one hundred six thousand, four hundred twenty-one".