161156606101040 has 320 divisors, whose sum is σ = 419802988889088. Its totient is φ = 57040787865600.

The previous prime is 161156606101039. The next prime is 161156606101171. The reversal of 161156606101040 is 40101606651161.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 161156606100985 and 161156606101003.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3608742392 + ... + 3608787048.

Almost surely, 2^{161156606101040} is an apocalyptic number.

161156606101040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161156606101040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209901494444544).

161156606101040 is an abundant number, since it is smaller than the sum of its proper divisors (258646382788048).

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

161156606101040 is a wasteful number, since it uses less digits than its factorization.

161156606101040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45476 (or 45470 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 161156606101040 in words is "one hundred sixty-one trillion, one hundred fifty-six billion, six hundred six million, one hundred one thousand, forty".