161111206615 has 8 divisors (see below), whose sum is σ = 193955100768. Its totient is φ = 128474530080.

The previous prime is 161111206579. The next prime is 161111206637. The reversal of 161111206615 is 516602111161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-161111206615 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51802692 + ... + 51805801.

It is an arithmetic number, because the mean of its divisors is an integer number (24244387596).

Almost surely, 2^161111206615 is an apocalyptic number.

161111206615 is a deficient number, since it is larger than the sum of its proper divisors (32843894153).

161111206615 is a wasteful number, since it uses less digits than its factorization.

161111206615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103608809.

The product of its (nonzero) digits is 2160, while the sum is 31.

Adding to 161111206615 its reverse (516602111161), we get a palindrome (677713317776).

The spelling of 161111206615 in words is "one hundred sixty-one billion, one hundred eleven million, two hundred six thousand, six hundred fifteen".