425650661 has 4 divisors (see below), whose sum is σ = 440328300. Its totient is φ = 410973024.

The previous prime is 425650639. The next prime is 425650669. The reversal of 425650661 is 166056524.

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 354568900 + 71081761 = 18830^2 + 8431^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-425650661 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 (425650669) 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, 7338776 + ... + 7338833.

It is an arithmetic number, because the mean of its divisors is an integer number (110082075).

Almost surely, 2^425650661 is an apocalyptic number.

It is an amenable number.

425650661 is a deficient number, since it is larger than the sum of its proper divisors (14677639).

425650661 is a wasteful number, since it uses less digits than its factorization.

425650661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14677638.

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

The square root of 425650661 is about 20631.3029399503. The cubic root of 425650661 is about 752.2307869483.

The spelling of 425650661 in words is "four hundred twenty-five million, six hundred fifty thousand, six hundred sixty-one".