1955778803 has 16 divisors (see below), whose sum is σ = 2231539200. Its totient is φ = 1696706880.

The previous prime is 1955778793. The next prime is 1955778829. The reversal of 1955778803 is 3088775591.

It is a happy number.

It is not a de Polignac number, because 1955778803 - 2⁶ = 1955778739 is a prime.

It is a super-2 number, since 2×1955778803² = 7650141452528225618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1955778833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102263 + ... + 119871.

It is an arithmetic number, because the mean of its divisors is an integer number (139471200).

Almost surely, 2^1955778803 is an apocalyptic number.

1955778803 is a deficient number, since it is larger than the sum of its proper divisors (275760397).

1955778803 is a wasteful number, since it uses less digits than its factorization.

1955778803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18082.

The product of its (nonzero) digits is 2116800, while the sum is 53.

The square root of 1955778803 is about 44224.1879857618. The cubic root of 1955778803 is about 1250.5658884176.

The spelling of 1955778803 in words is "one billion, nine hundred fifty-five million, seven hundred seventy-eight thousand, eight hundred three".