2291981478766 has 128 divisors (see below), whose sum is σ = 4228386914304. Its totient is φ = 910558091520.

The previous prime is 2291981478763. The next prime is 2291981478791. The reversal of 2291981478766 is 6678741891922.

It is a junction number, because it is equal to n+sod(n) for n = 2291981478695 and 2291981478704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291981478763) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1462654915 + ... + 1462656481.

It is an arithmetic number, because the mean of its divisors is an integer number (33034272768).

Almost surely, 2^{2291981478766} is an apocalyptic number.

2291981478766 is a deficient number, since it is larger than the sum of its proper divisors (1936405435538).

2291981478766 is a wasteful number, since it uses less digits than its factorization.

2291981478766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2534.

The product of its digits is 146313216, while the sum is 70.

The spelling of 2291981478766 in words is "two trillion, two hundred ninety-one billion, nine hundred eighty-one million, four hundred seventy-eight thousand, seven hundred sixty-six".