1947758772961 has 4 divisors (see below), whose sum is σ = 1948054926532. Its totient is φ = 1947462619392.

The previous prime is 1947758772917. The next prime is 1947758772997. The reversal of 1947758772961 is 1692778577491.

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

It can be written as a sum of positive squares in 2 ways, for example, as 903364707025 + 1044394065936 = 950455^2 + 1021956^2 .

It is a cyclic number.

It is not a de Polignac number, because 1947758772961 - 2⁷ = 1947758772833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1947758172961) 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, 148066920 + ... + 148080073.

It is an arithmetic number, because the mean of its divisors is an integer number (487013731633).

Almost surely, 2^{1947758772961} is an apocalyptic number.

It is an amenable number.

1947758772961 is a deficient number, since it is larger than the sum of its proper divisors (296153571).

1947758772961 is an equidigital number, since it uses as much as digits as its factorization.

1947758772961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296153570.

The product of its digits is 373403520, while the sum is 73.

The spelling of 1947758772961 in words is "one trillion, nine hundred forty-seven billion, seven hundred fifty-eight million, seven hundred seventy-two thousand, nine hundred sixty-one".