157661606806 has 24 divisors (see below), whose sum is σ = 259979369832. Its totient is φ = 71655223200.

The previous prime is 157661606779. The next prime is 157661606863. The reversal of 157661606806 is 608606166751.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2082981 + ... + 2157343.

It is an arithmetic number, because the mean of its divisors is an integer number (10832473743).

Almost surely, 2^157661606806 is an apocalyptic number.

157661606806 is a deficient number, since it is larger than the sum of its proper divisors (102317763026).

157661606806 is a wasteful number, since it uses less digits than its factorization.

157661606806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83148 (or 83137 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 52.

It can be divided in two parts, 157661 and 606806, that added together give a palindrome (764467).

The spelling of 157661606806 in words is "one hundred fifty-seven billion, six hundred sixty-one million, six hundred six thousand, eight hundred six".