20025155012666 has 4 divisors (see below), whose sum is σ = 30037732519002. Its totient is φ = 10012577506332.

The previous prime is 20025155012657. The next prime is 20025155012789. The reversal of 20025155012666 is 66621055152002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18848439907441 + 1176715105225 = 4341479^2 + 1084765^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5006288753165 + ... + 5006288753168.

Almost surely, 2^{20025155012666} is an apocalyptic number.

20025155012666 is a deficient number, since it is larger than the sum of its proper divisors (10012577506336).

20025155012666 is a wasteful number, since it uses less digits than its factorization.

20025155012666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10012577506335.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 20025155012666 in words is "twenty trillion, twenty-five billion, one hundred fifty-five million, twelve thousand, six hundred sixty-six".