2517011661 has 4 divisors (see below), whose sum is σ = 3356015552. Its totient is φ = 1678007772.

The previous prime is 2517011659. The next prime is 2517011669. The reversal of 2517011661 is 1661107152.

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 not a de Polignac number, because 2517011661 - 2¹ = 2517011659 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 (2517011669) 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, 419501941 + ... + 419501946.

It is an arithmetic number, because the mean of its divisors is an integer number (839003888).

Almost surely, 2^2517011661 is an apocalyptic number.

It is an amenable number.

2517011661 is a deficient number, since it is larger than the sum of its proper divisors (839003891).

2517011661 is an equidigital number, since it uses as much as digits as its factorization.

2517011661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839003890.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 2517011661 is about 50169.8281938458. The cubic root of 2517011661 is about 1360.2803021221.

The spelling of 2517011661 in words is "two billion, five hundred seventeen million, eleven thousand, six hundred sixty-one".