20245278551266 has 16 divisors (see below), whose sum is σ = 30412456796160. Its totient is φ = 10107797989680.

The previous prime is 20245278551263. The next prime is 20245278551269. The reversal of 20245278551266 is 66215587254202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20245278551263) and next prime (20245278551269).

It is a super-2 number, since 2×20245278551266² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20245278551263) 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, 6800976 + ... + 9313636.

It is an arithmetic number, because the mean of its divisors is an integer number (1900778549760).

Almost surely, 2^{20245278551266} is an apocalyptic number.

20245278551266 is a deficient number, since it is larger than the sum of its proper divisors (10167178244894).

20245278551266 is a wasteful number, since it uses less digits than its factorization.

20245278551266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2518569.

The product of its (nonzero) digits is 16128000, while the sum is 55.

The spelling of 20245278551266 in words is "twenty trillion, two hundred forty-five billion, two hundred seventy-eight million, five hundred fifty-one thousand, two hundred sixty-six".