1971264653250 has 32 divisors (see below), whose sum is σ = 4920276576384. Its totient is φ = 525670574000.

The previous prime is 1971264653233. The next prime is 1971264653291. The reversal of 1971264653250 is 523564621791.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1971264653193 and 1971264653202.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1314175686 + ... + 1314177185.

It is an arithmetic number, because the mean of its divisors is an integer number (153758643012).

Almost surely, 2^{1971264653250} is an apocalyptic number.

1971264653250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1971264653250 is an abundant number, since it is smaller than the sum of its proper divisors (2949011923134).

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

1971264653250 is a wasteful number, since it uses less digits than its factorization.

1971264653250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628352891 (or 2628352881 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 51.

The spelling of 1971264653250 in words is "one trillion, nine hundred seventy-one billion, two hundred sixty-four million, six hundred fifty-three thousand, two hundred fifty".