20966746457 has 4 divisors (see below), whose sum is σ = 20967522576. Its totient is φ = 20965970340.

The previous prime is 20966746441. The next prime is 20966746481. The reversal of 20966746457 is 75464766902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20966746457 - 2⁴ = 20966746441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20966746657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346019 + ... + 402072.

It is an arithmetic number, because the mean of its divisors is an integer number (5241880644).

Almost surely, 2^20966746457 is an apocalyptic number.

It is an amenable number.

20966746457 is a deficient number, since it is larger than the sum of its proper divisors (776119).

20966746457 is an equidigital number, since it uses as much as digits as its factorization.

20966746457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776118.

The product of its (nonzero) digits is 15240960, while the sum is 56.

The spelling of 20966746457 in words is "twenty billion, nine hundred sixty-six million, seven hundred forty-six thousand, four hundred fifty-seven".