166078780812 has 96 divisors (see below), whose sum is σ = 496440268800. Its totient is φ = 47031134976.

The previous prime is 166078780801. The next prime is 166078780817. The reversal of 166078780812 is 218087870661.

It is a happy number.

166078780812 is a `hidden beast` number, since 16 + 607 + 8 + 7 + 8 + 0 + 8 + 12 = 666.

It is a super-2 number, since 2×166078780812² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (166078780817) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 886612 + ... + 1057467.

It is an arithmetic number, because the mean of its divisors is an integer number (5171252800).

Almost surely, 2^166078780812 is an apocalyptic number.

166078780812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166078780812 is an abundant number, since it is smaller than the sum of its proper divisors (330361487988).

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

166078780812 is a wasteful number, since it uses less digits than its factorization.

166078780812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944212 (or 1944204 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 54.

The spelling of 166078780812 in words is "one hundred sixty-six billion, seventy-eight million, seven hundred eighty thousand, eight hundred twelve".