245500661520 has 120 divisors (see below), whose sum is σ = 824628945816. Its totient is φ = 65454465024.

The previous prime is 245500661513. The next prime is 245500661563. The reversal of 245500661520 is 25166005542.

245500661520 is a `hidden beast` number, since 2 + 45 + 500 + 6 + 61 + 52 + 0 = 666.

245500661520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 105567807744 + 139932853776 = 324912^2 + 374076^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4156032 + ... + 4214688.

Almost surely, 2^245500661520 is an apocalyptic number.

245500661520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

245500661520 is an abundant number, since it is smaller than the sum of its proper divisors (579128284296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

245500661520 is a wasteful number, since it uses less digits than its factorization.

245500661520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64489 (or 64480 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 245500661520 in words is "two hundred forty-five billion, five hundred million, six hundred sixty-one thousand, five hundred twenty".