20495759665 has 8 divisors (see below), whose sum is σ = 24611460480. Its totient is φ = 16385575152.

The previous prime is 20495759653. The next prime is 20495759681. The reversal of 20495759665 is 56695759402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20495759665 - 2⁹ = 20495759153 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1370895 + ... + 1385764.

It is an arithmetic number, because the mean of its divisors is an integer number (3076432560).

Almost surely, 2^20495759665 is an apocalyptic number.

It is an amenable number.

20495759665 is a deficient number, since it is larger than the sum of its proper divisors (4115700815).

20495759665 is a wasteful number, since it uses less digits than its factorization.

20495759665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758151.

The product of its (nonzero) digits is 20412000, while the sum is 58.

The spelling of 20495759665 in words is "twenty billion, four hundred ninety-five million, seven hundred fifty-nine thousand, six hundred sixty-five".