6346720028661 has 4 divisors (see below), whose sum is σ = 8462293371552. Its totient is φ = 4231146685772.

The previous prime is 6346720028657. The next prime is 6346720028711. The reversal of 6346720028661 is 1668200276436.

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.

It is a cyclic number.

It is not a de Polignac number, because 6346720028661 - 2² = 6346720028657 is a prime.

It is a super-2 number, since 2×6346720028661² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6346720078661) 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, 1057786671441 + ... + 1057786671446.

It is an arithmetic number, because the mean of its divisors is an integer number (2115573342888).

Almost surely, 2^{6346720028661} is an apocalyptic number.

It is an amenable number.

6346720028661 is a deficient number, since it is larger than the sum of its proper divisors (2115573342891).

6346720028661 is a wasteful number, since it uses less digits than its factorization.

6346720028661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115573342890.

The product of its (nonzero) digits is 3483648, while the sum is 51.

The spelling of 6346720028661 in words is "six trillion, three hundred forty-six billion, seven hundred twenty million, twenty-eight thousand, six hundred sixty-one".