1956503995778 has 4 divisors (see below), whose sum is σ = 2934755993670. Its totient is φ = 978251997888.

The previous prime is 1956503995757. The next prime is 1956503995781. The reversal of 1956503995778 is 8775993056591.

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., 1138153986649 + 818350009129 = 1066843^2 + 904627^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489125998943 + ... + 489125998946.

Almost surely, 2^{1956503995778} is an apocalyptic number.

1956503995778 is a deficient number, since it is larger than the sum of its proper divisors (978251997892).

1956503995778 is an equidigital number, since it uses as much as digits as its factorization.

1956503995778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978251997891.

The product of its (nonzero) digits is 642978000, while the sum is 74.

The spelling of 1956503995778 in words is "one trillion, nine hundred fifty-six billion, five hundred three million, nine hundred ninety-five thousand, seven hundred seventy-eight".