51643561511025 has 36 divisors (see below), whose sum is σ = 100908389284560. Its totient is φ = 25039302549600.

The previous prime is 51643561511011. The next prime is 51643561511033. The reversal of 51643561511025 is 52011516534615.

51643561511025 is a `hidden beast` number, since 5 + 1 + 6 + 4 + 3 + 5 + 615 + 1 + 1 + 0 + 25 = 666.

It is not a de Polignac number, because 51643561511025 - 2⁵ = 51643561510993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 10433040255 + ... + 10433045204.

It is an arithmetic number, because the mean of its divisors is an integer number (2803010813460).

Almost surely, 2^{51643561511025} is an apocalyptic number.

51643561511025 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51643561511025 is a deficient number, since it is larger than the sum of its proper divisors (49264827773535).

51643561511025 is a wasteful number, since it uses less digits than its factorization.

51643561511025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20866085486 (or 20866085478 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 45.

The spelling of 51643561511025 in words is "fifty-one trillion, six hundred forty-three billion, five hundred sixty-one million, five hundred eleven thousand, twenty-five".