50720894778761 has 4 divisors (see below), whose sum is σ = 50720979272400. Its totient is φ = 50720810285124.

The previous prime is 50720894778739. The next prime is 50720894778793. The reversal of 50720894778761 is 16787749802705.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 50720894778761 - 2¹⁰ = 50720894777737 is a prime.

It is a super-2 number, since 2×50720894778761² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50720894778161) 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, 41339891 + ... + 42549128.

It is an arithmetic number, because the mean of its divisors is an integer number (12680244818100).

Almost surely, 2^{50720894778761} is an apocalyptic number.

It is an amenable number.

50720894778761 is a deficient number, since it is larger than the sum of its proper divisors (84493639).

50720894778761 is an equidigital number, since it uses as much as digits as its factorization.

50720894778761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84493638.

The product of its (nonzero) digits is 331914240, while the sum is 71.

The spelling of 50720894778761 in words is "fifty trillion, seven hundred twenty billion, eight hundred ninety-four million, seven hundred seventy-eight thousand, seven hundred sixty-one".