5515011151661 has 4 divisors (see below), whose sum is σ = 6016375801824. Its totient is φ = 5013646501500.

The previous prime is 5515011151607. The next prime is 5515011151669. The reversal of 5515011151661 is 1661511105155.

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-5515011151661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5515011151669) 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, 250682325065 + ... + 250682325086.

It is an arithmetic number, because the mean of its divisors is an integer number (1504093950456).

Almost surely, 2^{5515011151661} is an apocalyptic number.

It is an amenable number.

5515011151661 is a deficient number, since it is larger than the sum of its proper divisors (501364650163).

5515011151661 is a wasteful number, since it uses less digits than its factorization.

5515011151661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501364650162.

The product of its (nonzero) digits is 22500, while the sum is 38.

The spelling of 5515011151661 in words is "five trillion, five hundred fifteen billion, eleven million, one hundred fifty-one thousand, six hundred sixty-one".