157861661079 has 16 divisors (see below), whose sum is σ = 211465900800. Its totient is φ = 104750412096.

The previous prime is 157861661077. The next prime is 157861661093. The reversal of 157861661079 is 970166168751.

It is a happy number.

It is not a de Polignac number, because 157861661079 - 2¹ = 157861661077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157861661077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 408787 + ... + 694859.

It is an arithmetic number, because the mean of its divisors is an integer number (13216618800).

Almost surely, 2^157861661079 is an apocalyptic number.

157861661079 is a deficient number, since it is larger than the sum of its proper divisors (53604239721).

157861661079 is a wasteful number, since it uses less digits than its factorization.

157861661079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286934.

The product of its (nonzero) digits is 3810240, while the sum is 57.

The spelling of 157861661079 in words is "one hundred fifty-seven billion, eight hundred sixty-one million, six hundred sixty-one thousand, seventy-nine".