2978427766961 has 4 divisors (see below), whose sum is σ = 3006263540592. Its totient is φ = 2950591993332.

The previous prime is 2978427766949. The next prime is 2978427766987. The reversal of 2978427766961 is 1696677248792.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2978427766961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2978427768961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13917886655 + ... + 13917886868.

It is an arithmetic number, because the mean of its divisors is an integer number (751565885148).

Almost surely, 2^{2978427766961} is an apocalyptic number.

It is an amenable number.

2978427766961 is a deficient number, since it is larger than the sum of its proper divisors (27835773631).

2978427766961 is a wasteful number, since it uses less digits than its factorization.

2978427766961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27835773630.

The product of its digits is 768144384, while the sum is 74.

The spelling of 2978427766961 in words is "two trillion, nine hundred seventy-eight billion, four hundred twenty-seven million, seven hundred sixty-six thousand, nine hundred sixty-one".