654025661 has 4 divisors (see below), whose sum is σ = 676578300. Its totient is φ = 631473024.

The previous prime is 654025637. The next prime is 654025681. The reversal of 654025661 is 166520456.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 441420100 + 212605561 = 21010^2 + 14581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-654025661 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 (654025681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11276276 + ... + 11276333.

It is an arithmetic number, because the mean of its divisors is an integer number (169144575).

Almost surely, 2^654025661 is an apocalyptic number.

It is an amenable number.

654025661 is a deficient number, since it is larger than the sum of its proper divisors (22552639).

654025661 is a wasteful number, since it uses less digits than its factorization.

654025661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22552638.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 654025661 is about 25573.9254124196. The cubic root of 654025661 is about 868.0237261419.

The spelling of 654025661 in words is "six hundred fifty-four million, twenty-five thousand, six hundred sixty-one".