172165381442 has 24 divisors (see below), whose sum is σ = 268484972688. Its totient is φ = 82794600360.

The previous prime is 172165381433. The next prime is 172165381447. The reversal of 172165381442 is 244183561271.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 172165381393 and 172165381402.

It is not an unprimeable number, because it can be changed into a prime (172165381447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38513 + ... + 588059.

It is an arithmetic number, because the mean of its divisors is an integer number (11186873862).

Almost surely, 2^172165381442 is an apocalyptic number.

172165381442 is a deficient number, since it is larger than the sum of its proper divisors (96319591246).

172165381442 is a wasteful number, since it uses less digits than its factorization.

172165381442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549774 (or 549743 counting only the distinct ones).

The product of its digits is 322560, while the sum is 44.

The spelling of 172165381442 in words is "one hundred seventy-two billion, one hundred sixty-five million, three hundred eighty-one thousand, four hundred forty-two".