26197911980 has 48 divisors (see below), whose sum is σ = 55583883264. Its totient is φ = 10371049920.

The previous prime is 26197911947. The next prime is 26197912007. The reversal of 26197911980 is 8911979162.

It is a super-2 number, since 2×26197911980² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4757909 + ... + 4763411.

It is an arithmetic number, because the mean of its divisors is an integer number (1157997568).

Almost surely, 2^26197911980 is an apocalyptic number.

26197911980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26197911980 is an abundant number, since it is smaller than the sum of its proper divisors (29385971284).

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

26197911980 is a wasteful number, since it uses less digits than its factorization.

26197911980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7926 (or 7924 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 53.

The spelling of 26197911980 in words is "twenty-six billion, one hundred ninety-seven million, nine hundred eleven thousand, nine hundred eighty".