161266371240 has 64 divisors (see below), whose sum is σ = 521014435200. Its totient is φ = 39696337152.

The previous prime is 161266371197. The next prime is 161266371247. The reversal of 161266371240 is 42173662161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (161266371247) 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, 51686380 + ... + 51689499.

It is an arithmetic number, because the mean of its divisors is an integer number (8140850550).

Almost surely, 2^161266371240 is an apocalyptic number.

161266371240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161266371240 is an abundant number, since it is smaller than the sum of its proper divisors (359748063960).

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

161266371240 is a wasteful number, since it uses less digits than its factorization.

161266371240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103375906 (or 103375902 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 161266371240 in words is "one hundred sixty-one billion, two hundred sixty-six million, three hundred seventy-one thousand, two hundred forty".