2046978991981 has 12 divisors (see below), whose sum is σ = 2597650521120. Its totient is φ = 1595048564760.

The previous prime is 2046978991969. The next prime is 2046978992011. The reversal of 2046978991981 is 1891998796402.

It is not a de Polignac number, because 2046978991981 - 2⁷ = 2046978991853 is a prime.

It is a super-2 number, since 2×2046978991981² (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 (2046978991931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1898866801 + ... + 1898867878.

It is an arithmetic number, because the mean of its divisors is an integer number (216470876760).

Almost surely, 2^{2046978991981} is an apocalyptic number.

It is an amenable number.

2046978991981 is a deficient number, since it is larger than the sum of its proper divisors (550671529139).

2046978991981 is a wasteful number, since it uses less digits than its factorization.

2046978991981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3797734704 (or 3797734697 counting only the distinct ones).

The product of its (nonzero) digits is 141087744, while the sum is 73.

The spelling of 2046978991981 in words is "two trillion, forty-six billion, nine hundred seventy-eight million, nine hundred ninety-one thousand, nine hundred eighty-one".