958391663 has 4 divisors (see below), whose sum is σ = 958495440. Its totient is φ = 958287888.

The previous prime is 958391659. The next prime is 958391671. The reversal of 958391663 is 366193859.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 366193859 = 19 ⋅19273361.

It is a cyclic number.

It is not a de Polignac number, because 958391663 - 2² = 958391659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (958391683) 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, 36518 + ... + 57011.

It is an arithmetic number, because the mean of its divisors is an integer number (239623860).

Almost surely, 2^958391663 is an apocalyptic number.

958391663 is a deficient number, since it is larger than the sum of its proper divisors (103777).

958391663 is a wasteful number, since it uses less digits than its factorization.

958391663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103776.

The product of its digits is 1049760, while the sum is 50.

The square root of 958391663 is about 30957.9014631160. The cubic root of 958391663 is about 985.9336189980.

The spelling of 958391663 in words is "nine hundred fifty-eight million, three hundred ninety-one thousand, six hundred sixty-three".