6650391990697 has 16 divisors (see below), whose sum is σ = 8185426141312. Its totient is φ = 5261637553920.

The previous prime is 6650391990689. The next prime is 6650391990707. The reversal of 6650391990697 is 7960991930566.

It is a cyclic number.

It is not a de Polignac number, because 6650391990697 - 2³ = 6650391990689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6650391990617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 835297 + ... + 3741457.

It is an arithmetic number, because the mean of its divisors is an integer number (511589133832).

Almost surely, 2^{6650391990697} is an apocalyptic number.

It is an amenable number.

6650391990697 is a deficient number, since it is larger than the sum of its proper divisors (1535034150615).

6650391990697 is a wasteful number, since it uses less digits than its factorization.

6650391990697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2931328.

The product of its (nonzero) digits is 148803480, while the sum is 70.

The spelling of 6650391990697 in words is "six trillion, six hundred fifty billion, three hundred ninety-one million, nine hundred ninety thousand, six hundred ninety-seven".