654215561021 has 16 divisors (see below), whose sum is σ = 745624811520. Its totient is φ = 568191684720.

The previous prime is 654215560897. The next prime is 654215561029. The reversal of 654215561021 is 120165512456.

654215561021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 654215561021 - 2¹⁴ = 654215544637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654215561029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1362761 + ... + 1779198.

It is an arithmetic number, because the mean of its divisors is an integer number (46601550720).

Almost surely, 2^654215561021 is an apocalyptic number.

It is an amenable number.

654215561021 is a deficient number, since it is larger than the sum of its proper divisors (91409250499).

654215561021 is a wasteful number, since it uses less digits than its factorization.

654215561021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3142816.

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 654215561021 in words is "six hundred fifty-four billion, two hundred fifteen million, five hundred sixty-one thousand, twenty-one".