26661132504 has 160 divisors (see below), whose sum is σ = 79430440320. Its totient is φ = 8326001664.

The previous prime is 26661132503. The next prime is 26661132581. The reversal of 26661132504 is 40523116662.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26661132503) 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, 2451142 + ... + 2461994.

It is an arithmetic number, because the mean of its divisors is an integer number (496440252).

Almost surely, 2^26661132504 is an apocalyptic number.

26661132504 is a gapful number since it is divisible by the number (24) 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 26661132504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39715220160).

26661132504 is an abundant number, since it is smaller than the sum of its proper divisors (52769307816).

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

26661132504 is a wasteful number, since it uses less digits than its factorization.

26661132504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11111 (or 11098 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 26661132504 in words is "twenty-six billion, six hundred sixty-one million, one hundred thirty-two thousand, five hundred four".