203955973977 has 128 divisors (see below), whose sum is σ = 337833361408. Its totient is φ = 106991539200.

The previous prime is 203955973913. The next prime is 203955973981. The reversal of 203955973977 is 779379559302.

It is not a de Polignac number, because 203955973977 - 2⁶ = 203955973913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (203955973997) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 186601443 + ... + 186602535.

It is an arithmetic number, because the mean of its divisors is an integer number (2639323136).

Almost surely, 2^203955973977 is an apocalyptic number.

It is an amenable number.

203955973977 is a deficient number, since it is larger than the sum of its proper divisors (133877387431).

203955973977 is a wasteful number, since it uses less digits than its factorization.

203955973977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359.

The product of its (nonzero) digits is 112521150, while the sum is 66.

The spelling of 203955973977 in words is "two hundred three billion, nine hundred fifty-five million, nine hundred seventy-three thousand, nine hundred seventy-seven".