161261371002 has 16 divisors (see below), whose sum is σ = 322548856992. Its totient is φ = 53749437840.

The previous prime is 161261370997. The next prime is 161261371003. The reversal of 161261371002 is 200173162161.

It is not an unprimeable number, because it can be changed into a prime (161261371003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1007388 + ... + 1156439.

It is an arithmetic number, because the mean of its divisors is an integer number (20159303562).

Almost surely, 2^161261371002 is an apocalyptic number.

161261371002 is an abundant number, since it is smaller than the sum of its proper divisors (161287485990).

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

161261371002 is a wasteful number, since it uses less digits than its factorization.

161261371002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176253.

The product of its (nonzero) digits is 3024, while the sum is 30.

The spelling of 161261371002 in words is "one hundred sixty-one billion, two hundred sixty-one million, three hundred seventy-one thousand, two".