166022811378 has 54 divisors (see below), whose sum is σ = 373637390061. Its totient is φ = 55325378808.

The previous prime is 166022811373. The next prime is 166022811397. The reversal of 166022811378 is 873118220661.

166022811378 is a `hidden beast` number, since 1 + 6 + 602 + 2 + 8 + 1 + 1 + 37 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 137445923169 + 28576888209 = 370737^2 + 169047^2 .

It is a tau number, because it is divible by the number of its divisors (54).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=288117.

It is not an unprimeable number, because it can be changed into a prime (166022811373) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 46673176 + ... + 46676732.

Almost surely, 2^166022811378 is an apocalyptic number.

166022811378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 166022811378

166022811378 is an abundant number, since it is smaller than the sum of its proper divisors (207614578683).

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

166022811378 is an frugal number, since it uses more digits than its factorization.

166022811378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7140 (or 3562 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 166022811378 in words is "one hundred sixty-six billion, twenty-two million, eight hundred eleven thousand, three hundred seventy-eight".