212790653797 has 4 divisors (see below), whose sum is σ = 214742861740. Its totient is φ = 210838445856.

The previous prime is 212790653771. The next prime is 212790653813. The reversal of 212790653797 is 797356097212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 132026129316 + 80764524481 = 363354^2 + 284191^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212790653797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212790653297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 976103808 + ... + 976104025.

It is an arithmetic number, because the mean of its divisors is an integer number (53685715435).

Almost surely, 2^212790653797 is an apocalyptic number.

It is an amenable number.

212790653797 is a deficient number, since it is larger than the sum of its proper divisors (1952207943).

212790653797 is a wasteful number, since it uses less digits than its factorization.

212790653797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952207942.

The product of its (nonzero) digits is 10001880, while the sum is 58.

The spelling of 212790653797 in words is "two hundred twelve billion, seven hundred ninety million, six hundred fifty-three thousand, seven hundred ninety-seven".