161077815 has 20 divisors (see below), whose sum is σ = 288747624. Its totient is φ = 85907952.

The previous prime is 161077811. The next prime is 161077823. The reversal of 161077815 is 518770161.

It is a happy number.

It is not a de Polignac number, because 161077815 - 2² = 161077811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161077815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161077811) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 198457 + ... + 199266.

Almost surely, 2^161077815 is an apocalyptic number.

161077815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161077815 is a deficient number, since it is larger than the sum of its proper divisors (127669809).

161077815 is an equidigital number, since it uses as much as digits as its factorization.

161077815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397740 (or 397731 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 36.

The square root of 161077815 is about 12691.6435105939. The cubic root of 161077815 is about 544.0998129551.

The spelling of 161077815 in words is "one hundred sixty-one million, seventy-seven thousand, eight hundred fifteen".