11816777025 has 27 divisors (see below), whose sum is σ = 21168081571. Its totient is φ = 6301411440.

The previous prime is 11816777023. The next prime is 11816777029. The reversal of 11816777025 is 52077761811.

The square root of 11816777025 is 108705.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4254039729 + 7562737296 = 65223^2 + 86964^2 .

It is not a de Polignac number, because 11816777025 - 2¹ = 11816777023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11816777023) 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, 1626952 + ... + 1634198.

Almost surely, 2^11816777025 is an apocalyptic number.

11816777025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11816777025 is the 108705-th square number.

11816777025 is the 54353-rd centered octagonal number.

It is an amenable number.

11816777025 is a deficient number, since it is larger than the sum of its proper divisors (9351304546).

11816777025 is an frugal number, since it uses more digits than its factorization.

11816777025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14510 (or 7255 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 45.

The spelling of 11816777025 in words is "eleven billion, eight hundred sixteen million, seven hundred seventy-seven thousand, twenty-five".