245165661 has 24 divisors (see below), whose sum is σ = 390245856. Its totient is φ = 147359520.

The previous prime is 245165621. The next prime is 245165689. The reversal of 245165661 is 166561542.

It is not a de Polignac number, because 245165661 - 2⁶ = 245165597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245165621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19335 + ... + 29396.

It is an arithmetic number, because the mean of its divisors is an integer number (16260244).

Almost surely, 2^245165661 is an apocalyptic number.

It is an amenable number.

245165661 is a deficient number, since it is larger than the sum of its proper divisors (145080195).

245165661 is a wasteful number, since it uses less digits than its factorization.

245165661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48793 (or 48790 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 245165661 is about 15657.7667947891. The cubic root of 245165661 is about 625.8734760812.

The spelling of 245165661 in words is "two hundred forty-five million, one hundred sixty-five thousand, six hundred sixty-one".