84158145661 has 4 divisors (see below), whose sum is σ = 84298644000. Its totient is φ = 84017647324.

The previous prime is 84158145647. The next prime is 84158145671. The reversal of 84158145661 is 16654185148.

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 84158145661 - 2⁵ = 84158145629 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 (84158145671) 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, 70248271 + ... + 70249468.

It is an arithmetic number, because the mean of its divisors is an integer number (21074661000).

Almost surely, 2^84158145661 is an apocalyptic number.

It is an amenable number.

84158145661 is a deficient number, since it is larger than the sum of its proper divisors (140498339).

84158145661 is a wasteful number, since it uses less digits than its factorization.

84158145661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140498338.

The product of its digits is 921600, while the sum is 49.

The spelling of 84158145661 in words is "eighty-four billion, one hundred fifty-eight million, one hundred forty-five thousand, six hundred sixty-one".