1515055665161 has 4 divisors (see below), whose sum is σ = 1540734574800. Its totient is φ = 1489376755524.

The previous prime is 1515055665049. The next prime is 1515055665217. The reversal of 1515055665161 is 1615665505151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1515055665161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1515055665661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12839454731 + ... + 12839454848.

It is an arithmetic number, because the mean of its divisors is an integer number (385183643700).

Almost surely, 2^{1515055665161} is an apocalyptic number.

It is an amenable number.

1515055665161 is a deficient number, since it is larger than the sum of its proper divisors (25678909639).

1515055665161 is an equidigital number, since it uses as much as digits as its factorization.

1515055665161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25678909638.

The product of its (nonzero) digits is 675000, while the sum is 47.

The spelling of 1515055665161 in words is "one trillion, five hundred fifteen billion, fifty-five million, six hundred sixty-five thousand, one hundred sixty-one".