26661011490 has 80 divisors (see below), whose sum is σ = 72163586880. Its totient is φ = 7062487200.

The previous prime is 26661011473. The next prime is 26661011491. The reversal of 26661011490 is 9411016662.

It is not an unprimeable number, because it can be changed into a prime (26661011491) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 13321 + ... + 231299.

It is an arithmetic number, because the mean of its divisors is an integer number (902044836).

Almost surely, 2^26661011490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26661011490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36081793440).

26661011490 is an abundant number, since it is smaller than the sum of its proper divisors (45502575390).

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

26661011490 is a wasteful number, since it uses less digits than its factorization.

26661011490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218149 (or 218140 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 26661011490 in words is "twenty-six billion, six hundred sixty-one million, eleven thousand, four hundred ninety".