26166297780 has 192 divisors, whose sum is σ = 95015854080. Its totient is φ = 5853575808.

The previous prime is 26166297763. The next prime is 26166297791. The reversal of 26166297780 is 8779266162.

26166297780 is a `hidden beast` number, since 2 + 6 + 1 + 6 + 629 + 7 + 7 + 8 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 104019 + ... + 251301.

It is an arithmetic number, because the mean of its divisors is an integer number (494874240).

Almost surely, 2^26166297780 is an apocalyptic number.

26166297780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26166297780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47507927040).

26166297780 is an abundant number, since it is smaller than the sum of its proper divisors (68849556300).

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

26166297780 is a wasteful number, since it uses less digits than its factorization.

26166297780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147355 (or 147347 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 26166297780 in words is "twenty-six billion, one hundred sixty-six million, two hundred ninety-seven thousand, seven hundred eighty".