50778205400987 has 4 divisors (see below), whose sum is σ = 50779839169896. Its totient is φ = 50776571632080.

The previous prime is 50778205400969. The next prime is 50778205401031. The reversal of 50778205400987 is 78900450287705.

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

It is a cyclic number.

It is not a de Polignac number, because 50778205400987 - 2⁸ = 50778205400731 is a prime.

It is a super-2 number, since 2×50778205400987² (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 (50778205400687) 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, 816837833 + ... + 816899994.

It is an arithmetic number, because the mean of its divisors is an integer number (12694959792474).

Almost surely, 2^{50778205400987} is an apocalyptic number.

50778205400987 is a deficient number, since it is larger than the sum of its proper divisors (1633768909).

50778205400987 is a wasteful number, since it uses less digits than its factorization.

50778205400987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633768908.

The product of its (nonzero) digits is 39513600, while the sum is 62.

The spelling of 50778205400987 in words is "fifty trillion, seven hundred seventy-eight billion, two hundred five million, four hundred thousand, nine hundred eighty-seven".