161257605810 has 32 divisors (see below), whose sum is σ = 442306576512. Its totient is φ = 36858881280.

The previous prime is 161257605767. The next prime is 161257605811. The reversal of 161257605810 is 18506752161.

It is a super-2 number, since 2×161257605810² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (161257605811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 383946471 + ... + 383946890.

It is an arithmetic number, because the mean of its divisors is an integer number (13822080516).

Almost surely, 2^161257605810 is an apocalyptic number.

161257605810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161257605810 is an abundant number, since it is smaller than the sum of its proper divisors (281048970702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161257605810 is a wasteful number, since it uses less digits than its factorization.

161257605810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767893378.

The product of its (nonzero) digits is 100800, while the sum is 42.

The spelling of 161257605810 in words is "one hundred sixty-one billion, two hundred fifty-seven million, six hundred five thousand, eight hundred ten".