84369607561 has 4 divisors (see below), whose sum is σ = 88037851392. Its totient is φ = 80701363732.

The previous prime is 84369607537. The next prime is 84369607603. The reversal of 84369607561 is 16570696348.

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 a de Polignac number, because none of the positive numbers 2^k-84369607561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84369607061) 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, 1834121881 + ... + 1834121926.

It is an arithmetic number, because the mean of its divisors is an integer number (22009462848).

Almost surely, 2^84369607561 is an apocalyptic number.

It is an amenable number.

84369607561 is a deficient number, since it is larger than the sum of its proper divisors (3668243831).

84369607561 is a wasteful number, since it uses less digits than its factorization.

84369607561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3668243830.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 84369607561 in words is "eighty-four billion, three hundred sixty-nine million, six hundred seven thousand, five hundred sixty-one".