6156166650661 has 4 divisors (see below), whose sum is σ = 6287148919872. Its totient is φ = 6025184381452.

The previous prime is 6156166650643. The next prime is 6156166650671. The reversal of 6156166650661 is 1660566616516.

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 6156166650661 - 2³³ = 6147576716069 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 (6156166650671) 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, 65491134535 + ... + 65491134628.

It is an arithmetic number, because the mean of its divisors is an integer number (1571787229968).

Almost surely, 2^{6156166650661} is an apocalyptic number.

It is an amenable number.

6156166650661 is a deficient number, since it is larger than the sum of its proper divisors (130982269211).

6156166650661 is a wasteful number, since it uses less digits than its factorization.

6156166650661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130982269210.

The product of its (nonzero) digits is 6998400, while the sum is 55.

The spelling of 6156166650661 in words is "six trillion, one hundred fifty-six billion, one hundred sixty-six million, six hundred fifty thousand, six hundred sixty-one".