161099209270 has 32 divisors (see below), whose sum is σ = 294577710336. Its totient is φ = 63419426400.

The previous prime is 161099209253. The next prime is 161099209289. The reversal of 161099209270 is 72902990161.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 161099209270.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 620775 + ... + 841165.

It is an arithmetic number, because the mean of its divisors is an integer number (9205553448).

Almost surely, 2^161099209270 is an apocalyptic number.

161099209270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161099209270 is a deficient number, since it is larger than the sum of its proper divisors (133478501066).

161099209270 is a wasteful number, since it uses less digits than its factorization.

161099209270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221556.

The product of its (nonzero) digits is 122472, while the sum is 46.

The spelling of 161099209270 in words is "one hundred sixty-one billion, ninety-nine million, two hundred nine thousand, two hundred seventy".