3958463661 has 4 divisors (see below), whose sum is σ = 5277951552. Its totient is φ = 2638975772.

The previous prime is 3958463659. The next prime is 3958463681. The reversal of 3958463661 is 1663648593.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1663648593 = 3 ⋅554549531.

It is a cyclic number.

It is not a de Polignac number, because 3958463661 - 2¹ = 3958463659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3958463681) 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, 659743941 + ... + 659743946.

It is an arithmetic number, because the mean of its divisors is an integer number (1319487888).

Almost surely, 2^3958463661 is an apocalyptic number.

It is an amenable number.

3958463661 is a deficient number, since it is larger than the sum of its proper divisors (1319487891).

3958463661 is a wasteful number, since it uses less digits than its factorization.

3958463661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319487890.

The product of its digits is 2799360, while the sum is 51.

The square root of 3958463661 is about 62916.3226913334. The cubic root of 3958463661 is about 1581.8873537765.

The spelling of 3958463661 in words is "three billion, nine hundred fifty-eight million, four hundred sixty-three thousand, six hundred sixty-one".