12661075572 has 24 divisors (see below), whose sum is σ = 29544384576. Its totient is φ = 4220090688.

The previous prime is 12661075571. The next prime is 12661075573. The reversal of 12661075572 is 27557016621.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12661075571) and next prime (12661075573).

It is a super-4 number, since 4×12661075572⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12661075571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283608 + ... + 325200.

It is an arithmetic number, because the mean of its divisors is an integer number (1231016024).

Almost surely, 2^12661075572 is an apocalyptic number.

12661075572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12661075572 is an abundant number, since it is smaller than the sum of its proper divisors (16883309004).

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

12661075572 is a wasteful number, since it uses less digits than its factorization.

12661075572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66967 (or 66965 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 42.

The spelling of 12661075572 in words is "twelve billion, six hundred sixty-one million, seventy-five thousand, five hundred seventy-two".