6461667617 has 4 divisors (see below), whose sum is σ = 6510993456. Its totient is φ = 6412341780.

The previous prime is 6461667557. The next prime is 6461667647. The reversal of 6461667617 is 7167661646.

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: 7167661646 = 2 ⋅3583830823.

It is a cyclic number.

It is not a de Polignac number, because 6461667617 - 2¹² = 6461663521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6461667647) 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, 24662723 + ... + 24662984.

It is an arithmetic number, because the mean of its divisors is an integer number (1627748364).

Almost surely, 2^6461667617 is an apocalyptic number.

It is an amenable number.

6461667617 is a deficient number, since it is larger than the sum of its proper divisors (49325839).

6461667617 is a wasteful number, since it uses less digits than its factorization.

6461667617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49325838.

The product of its digits is 1524096, while the sum is 50.

The square root of 6461667617 is about 80384.4986113616. The cubic root of 6461667617 is about 1862.5797264612.

The spelling of 6461667617 in words is "six billion, four hundred sixty-one million, six hundred sixty-seven thousand, six hundred seventeen".