1978760904781 has 4 divisors (see below), whose sum is σ = 1979102606464. Its totient is φ = 1978419203100.

The previous prime is 1978760904779. The next prime is 1978760904787. The reversal of 1978760904781 is 1874090678791.

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 not a de Polignac number, because 1978760904781 - 2¹ = 1978760904779 is a prime.

It is a super-2 number, since 2×1978760904781² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978760904787) 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, 170842155 + ... + 170853736.

It is an arithmetic number, because the mean of its divisors is an integer number (494775651616).

Almost surely, 2^{1978760904781} is an apocalyptic number.

It is an amenable number.

1978760904781 is a deficient number, since it is larger than the sum of its proper divisors (341701683).

1978760904781 is an equidigital number, since it uses as much as digits as its factorization.

1978760904781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341701682.

The product of its (nonzero) digits is 42674688, while the sum is 67.

The spelling of 1978760904781 in words is "one trillion, nine hundred seventy-eight billion, seven hundred sixty million, nine hundred four thousand, seven hundred eighty-one".