10001561667 has 4 divisors (see below), whose sum is σ = 13335415560. Its totient is φ = 6667707776.

The previous prime is 10001561629. The next prime is 10001561681. The reversal of 10001561667 is 76616510001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10001561667 - 2⁷ = 10001561539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10001561617) 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, 1666926942 + ... + 1666926947.

It is an arithmetic number, because the mean of its divisors is an integer number (3333853890).

Almost surely, 2^10001561667 is an apocalyptic number.

10001561667 is a deficient number, since it is larger than the sum of its proper divisors (3333853893).

10001561667 is an equidigital number, since it uses as much as digits as its factorization.

10001561667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333853892.

The product of its (nonzero) digits is 7560, while the sum is 33.

The spelling of 10001561667 in words is "ten billion, one million, five hundred sixty-one thousand, six hundred sixty-seven".