245665021525 has 144 divisors (see below), whose sum is σ = 402405494400. Its totient is φ = 144513331200.

The previous prime is 245665021517. The next prime is 245665021541. The reversal of 245665021525 is 525120566542.

It is not a de Polignac number, because 245665021525 - 2³ = 245665021517 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 234189201 + ... + 234190249.

It is an arithmetic number, because the mean of its divisors is an integer number (2794482600).

Almost surely, 2^245665021525 is an apocalyptic number.

245665021525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

245665021525 is a deficient number, since it is larger than the sum of its proper divisors (156740472875).

245665021525 is a wasteful number, since it uses less digits than its factorization.

245665021525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452 (or 1428 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 43.

The spelling of 245665021525 in words is "two hundred forty-five billion, six hundred sixty-five million, twenty-one thousand, five hundred twenty-five".