79661570854 has 4 divisors (see below), whose sum is σ = 119492356284. Its totient is φ = 39830785426.

The previous prime is 79661570839. The next prime is 79661570897. The reversal of 79661570854 is 45807516697.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45807516697 = 2273 ⋅20152889.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19915392712 + ... + 19915392715.

It is an arithmetic number, because the mean of its divisors is an integer number (29873089071).

Almost surely, 2^79661570854 is an apocalyptic number.

79661570854 is a deficient number, since it is larger than the sum of its proper divisors (39830785430).

79661570854 is a wasteful number, since it uses less digits than its factorization.

79661570854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39830785429.

The product of its (nonzero) digits is 12700800, while the sum is 58.

The spelling of 79661570854 in words is "seventy-nine billion, six hundred sixty-one million, five hundred seventy thousand, eight hundred fifty-four".