49755791978 has 4 divisors (see below), whose sum is σ = 74633687970. Its totient is φ = 24877895988.

The previous prime is 49755791977. The next prime is 49755791999. The reversal of 49755791978 is 87919755794.

49755791978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 47701617649 + 2054174329 = 218407^2 + 45323^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (49755791971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12438947993 + ... + 12438947996.

Almost surely, 2^49755791978 is an apocalyptic number.

49755791978 is a deficient number, since it is larger than the sum of its proper divisors (24877895992).

49755791978 is a wasteful number, since it uses less digits than its factorization.

49755791978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24877895991.

The product of its digits is 200037600, while the sum is 71.

The spelling of 49755791978 in words is "forty-nine billion, seven hundred fifty-five million, seven hundred ninety-one thousand, nine hundred seventy-eight".