661500451217725 has 96 divisors (see below), whose sum is σ = 970014968640000. Its totient is φ = 447254177610240.

The previous prime is 661500451217497. The next prime is 661500451217747. The reversal of 661500451217725 is 527712154005166.

661500451217725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-661500451217725 is a prime.

It is a super-2 number, since 2×661500451217725² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 272772619 + ... + 275187031.

It is an arithmetic number, because the mean of its divisors is an integer number (10104322590000).

Almost surely, 2^{661500451217725} is an apocalyptic number.

It is an amenable number.

661500451217725 is a deficient number, since it is larger than the sum of its proper divisors (308514517422275).

661500451217725 is a wasteful number, since it uses less digits than its factorization.

661500451217725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2414892 (or 2414873 counting only the distinct ones).

The product of its (nonzero) digits is 3528000, while the sum is 52.

The spelling of 661500451217725 in words is "six hundred sixty-one trillion, five hundred billion, four hundred fifty-one million, two hundred seventeen thousand, seven hundred twenty-five".