1915978913766 has 12 divisors (see below), whose sum is σ = 4151287646532. Its totient is φ = 638659637916.

The previous prime is 1915978913753. The next prime is 1915978913767. The reversal of 1915978913766 is 6673198795191.

1915978913766 is a `hidden beast` number, since 1 + 91 + 5 + 97 + 89 + 1 + 376 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1915978913694 and 1915978913703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1915978913767) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53221636476 + ... + 53221636511.

It is an arithmetic number, because the mean of its divisors is an integer number (345940637211).

Almost surely, 2^{1915978913766} is an apocalyptic number.

1915978913766 is an abundant number, since it is smaller than the sum of its proper divisors (2235308732766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1915978913766 is a wasteful number, since it uses less digits than its factorization.

1915978913766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106443272995 (or 106443272992 counting only the distinct ones).

The product of its digits is 154314720, while the sum is 72.

The spelling of 1915978913766 in words is "one trillion, nine hundred fifteen billion, nine hundred seventy-eight million, nine hundred thirteen thousand, seven hundred sixty-six".