1961687777343 has 32 divisors (see below), whose sum is σ = 3049580606976. Its totient is φ = 1098390903168.

The previous prime is 1961687777323. The next prime is 1961687777359. The reversal of 1961687777343 is 3437777861691.

It is not a de Polignac number, because 1961687777343 - 2²² = 1961683583039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961687777323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 279705 + ... + 2000402.

It is an arithmetic number, because the mean of its divisors is an integer number (95299393968).

Almost surely, 2^{1961687777343} is an apocalyptic number.

1961687777343 is a deficient number, since it is larger than the sum of its proper divisors (1087892829633).

1961687777343 is a wasteful number, since it uses less digits than its factorization.

1961687777343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280943.

The product of its digits is 224042112, while the sum is 69.

The spelling of 1961687777343 in words is "one trillion, nine hundred sixty-one billion, six hundred eighty-seven million, seven hundred seventy-seven thousand, three hundred forty-three".